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A Systematic Literature Review
on Microservices
Hulya Vural, Murat Koyuncu(&)
, and Sinem Guney
Atilim University, Ankara, Turkey
hulya.vural.tr@gmail.com,sinemmguney@gmail.com,
mkoyuncu@atilim.edu.tr
Abstract. The cloud is an emerging paradigm which leads the way for different
approaches and standards. The architectural styles are evolving based on the
requirements of the cloud as well. In recent years microservices is seen as the
architecture style for scalable, fast evolving cloud applications. As part of this
paper, a systematic mapping study was carried out around microservices. It is
aiming to find out the current trends around microservices, the motivation
behind microservices research, emerging standards and the possible research
gaps. The obtained results can help researchers and practitioner in software
engineering domain who want to be aware of new trends about SOA and cloud
computing.
Keywords: Cloud  SOA  Web services  Microservices  Systematic
mapping
1 Introduction
Service-oriented architecture (SOA) has emerged as a means of developing distributed
systems where the components are stand-alone services [37]. Services are basic units
which are developed independently and made accessible over the Internet. Standard
internet protocols are used for service communication among different computers. SOA
provides many advantages to develop easy and economic distributed software systems
and, therefore, it is the leading technology for interoperability on today’s internet
world. Service-oriented software engineering defines evolution of existing software
engineering approaches to develop dependable and reusable services considering the
requirements and characteristics of this technology [37]. Service-oriented computing
(SOC) is the paradigm that utilizes services as the fundamental elements for developing
applications. Therefore, service-oriented software engineering aims at designing and
developing service-based applications consonant with SOC paradigm and SOA prin-
ciples using software engineering methodologies.
After the popularity of cloud computing in recent years, new trends in the software
engineering have emerged, such as going to market with minimal viable product and
making small development teams autonomous. The architectural styles have also
evolved based on the cloud environment needs [36]. One of those new architectural
styles is microservices. The aim of the microservices is to divide the business behavior
into small services which can run independent of each other. As mentioned by Martin
© Springer International Publishing AG 2017
O. Gervasi et al. (Eds.): ICCSA 2017, Part VI, LNCS 10409, pp. 203–217, 2017.
DOI: 10.1007/978-3-319-62407-5_14
Fowler, “While there is no precise definition of this architectural style, there are certain
common characteristics around organization around business capability, automated
deployment, intelligence in the endpoints, and decentralized control of languages and
data” [1]. Another definition for microservices is “Microservices are small, autonomous
services that work together” [2].
The characteristics of the microservices are listed as follows [1]:
• Componentization via Services
• Organized around Business Capabilities
• Products not Projects
• Smart endpoints and dumb pipes
• Decentralized Governance
• Decentralized Data Management
• Infrastructure Automation
• Design for failure
• Evolutionary Design
The microservices are developed, deployed and maintained separately. This allows
the teams to be autonomous where they can decide on the technology to use which best
addresses the current needs of the business behavior. The language and the database
might be different from one microservice to another. They do not share data between
each other, instead they use Representational State Transfer (REST) protocol to
communicate to each other. The most important benefits of using microservices are
agility, autonomy, scalability, resilience and easy continuous deployment.
Even though microservices were first mentioned at [60] in 2010, the definition of
the microservice mentioned in that study does not totally map to the current
microservice definition in literature. The study carried out in 2010 [60] defines
microservices as light services using REST. It does not mention most of the charac-
teristics listed at [1].
There has been another systematic mapping carried out on microservices in 2016
[40]. In that study, the research questions are around the architectural diagrams used for
microservices’ representation, the quality attributes and the challenges. However, the
emerging standards and de facto tools are not mentioned.
In this paper, the aim is to not only analyze the emerging standards but also the
types of research conducted and the practical motivations around carrying out the
microservices architecture.
2 Method
This study is conducted a systematic mapping as defined in [3] with one modification
(see Fig. 1). The modification is that, we carry out the keywording according to the
whole paper instead of keywording according to the abstract. The reason for the
modification to the original process is to enhance the classification criteria through
adding new areas.
204 H. Vural et al.
2.1 Research Questions
Three research questions are determined as follows:
RQ1: What type of research is conducted on microservices?
RQ2: What are the main practical motivations behind microservices related research?
RQ3: What are the emerging standards and de facto tools on microservices solutions?
2.2 Search Sampling
The search is conducted using Web of Science (Thomson Reuters Web of Knowledge),
which includes the following online databases:
• ACM (Association for Computing Machinery) Digital Library [4]
• CiteSeer [5]
• Computer Source [6]
• ebrary [7]
• Human-Computer Interaction Bibliography [8]
• IEEE Xplore [9]
• INSPEC [10]
• INSPEC Archive [11]
• Nature [12]
• Science [13]
• Science  Technology Collection [14]
• SciTech Connect [15]
• Springer LINK [16]
2.3 Search Iteration
The search is carried on with the following criteria:
• Keywords: microservice OR micro-service
• Research Area: Computer Science
The search iteration has returned 39 results [17–32, 38–60].
Fig. 1. Process steps and outcomes
A Systematic Literature Review on Microservices 205
3 Screening the Papers
The papers are evaluated according to the inclusion and exclusion criteria. The ones
which do not meet the criteria are excluded.
The inclusion criteria:
• All papers returned from the search criteria
Exclusion criteria:
• If the microservices is just mentioned in the research but the focus of the research is
not directly on microservices.
Out of 39, 2 papers were excluded based on the exclusion criteria [30, 41]. As a
result, 37 papers are included into the mapping process.
4 Keywording
As part of keywording four different categorization schemes are identified:
• Service models in cloud computing
• Operational areas
• Research types
• Emerging standards and tools.
4.1 Service Models in Cloud Computing
The service models in cloud computing are classified in three different types [33]:
• Infrastructure as a Service (IaaS): the infrastructure is supplied as a service (e.g.
virtual machine, hard disk, load balancer etc.).
• Platform as a Service (PaaS): The platform is supplied as a service (e.g. Azure SQL,
Tomcat etc.).
• Software as a Service (SaaS): The software itself is supplied as a service (e.g. Office
365, Gmail etc.).
Even though the microservice architecture style is shaped considering cloud needs,
the research papers returned as part of the search criteria do not necessarily use cloud.
As a result, on premise installations (OnPrem) are also included in the service models.
4.2 Operational Areas
In [34] several different operational areas are called out for cloud:
• Accounting and billing
• SLA management (Service Level Agreement)
• Service/resource provisioning
206 H. Vural et al.
• Capacity planning
• Configuration management
• Security and privacy assurance
• Fault management
Some of the research papers included in the current study are focusing on cloud
whereas some are not. As a result, the operational areas were modified to fit the needs
as follows:
• Cost comparison
• Availability/Resiliency
• Performance
• Security
• Test technique
• Functionality/Design
• Analytics/Monitoring
• Scalability
• Deployment
The answer for the second research question (RQ2) will be based on the modified
operational areas.
4.3 Research Types
In [35], 6 different research types are called out (See Table 1). The answer to the first
research question (RQ1) will be based on these 6 research types.
4.4 Emerging Standards and Tools
The papers included in this systematic mapping study can be seen as a representation of
the common tools used for microservices. Given that microservices is a new concept,
the standards are not yet well formed. The current systematic study aims also to give an
answer on emerging standards for microservices.
5 Data Extraction and Mapping
The results obtained from mapping are converted into different graphs and they are
given below in a way to answer the defined research questions.
RQ1: What type of research is conducted on microservices?
The papers are mapped to the research types as seen in Fig. 2. The most widely
used research type is Solution Proposal which is followed by Validation Research and
Evaluation Research.
The papers are classified according to the service types as seen in Fig. 3. Almost
half of the papers did not explicitly mention the service type they were targeting
A Systematic Literature Review on Microservices 207
(represented as NA in the figure). SaaS by far the most common service type being
investigated. Also, some papers refer to more than one service type.
The bubble chart in Fig. 4 illustrates an analysis based on research types versus
service types. The figure shows that there are only two studies on IaaS investigation
regarding microservices. This is an expected outcome given that the microservices is a
high level architectural style. On the other hand, there is only one official philosophical
research papers on microservices. Most probably the reason is that the philosophical
Table 1. Research types
Class Description
Validation
research
Techniques investigated are novel and have not yet been implemented in
practice. Techniques used are for example experiments, i.e., work done in
the lab
Evaluation
research
Techniques are implemented in practice and an evaluation of the technique
is conducted. That means, it is shown how the technique is implemented in
practice (solution implementation) and what are the consequences of the
implementation in terms of benefits and drawbacks (implementation
evaluation). This also includes identification of problems in industry
Solution
proposal
A solution for a problem is proposed, the solution can be either novel or a
significant extension of an existing technique. The potential benefits and
the applicability of the solution is shown by a small example or a good line
of argumentation
Philosophical
papers
These papers sketch a new way of looking at existing things by structuring
the field inform of a taxonomy or conceptual framework
Opinion papers These papers express the personal opinion of somebody whether a certain
technique is good or bad, or how things should have been done. They do
not rely on related work and research methodologies
Experience
papers
Experience papers explain what and how something has been done in
practice. It has to be the personal experience of the author
Fig. 2. Research types
208 H. Vural et al.
statement of microservices was laid out by Lewis and Fowler [1] on 2014. Mostly, the
research is around Solution Proposal which do not explicitly call out the possible
service types applicable for that solution.
RQ2: What are the main practical motivations behind microservices related research?
The papers are mapped to the operational areas and obtained results are shown in
Fig. 5. The main motives are around functionality followed by performance and test
techniques. Given that the microservices paradigm was first mentioned around 2014
and official research papers started to show up in 2015, it is natural to expect the
functionality be main concerns of research.
Fig. 3. Count of papers per service type
Research Type vs Service Type
Philosophical Paper
Opinion Paper
Personal Experience
Proposal of SoluƟon
EvaluaƟon Research
ValidaƟon Research
NA
SaaS
PaaS
IaaS
OnPremise
Fig. 4. Service types versus research types
A Systematic Literature Review on Microservices 209
Figure 6 aims to answer if the study has empirical results or not. Our analysis
shows that the empirical studies are currently small in amount. Figure 7 illustrates an
analysis based on operational areas versus service types. The most remarkable point is
that most of the studies focus on the functionality/design issues. Figure 8 shows if there
is a new solution proposed and/or implemented. As seen in the figure, most of the
Fig. 5. Operational areas
Fig. 6. Empirical results in research
210 H. Vural et al.
research propose new solutions. Another noticeable point is that the implementation
ratio of new solutions is higher than the implementation ratio of existing solutions.
RQ3: What are the emerging standards and de facto tools on microservices solutions?
The occurrence of standards proposed or implemented in the research papers
included into the systematic mapping can be seen in Fig. 9. The figure includes all the
standards either implemented or proposed in systematic mapping papers. As clearly
seen in the figure, REST can be called out as the standard for Microservices, even
though there is one outlier paper which used non-REST protocol in their study [28].
OperaƟonal Area vs Service Type
AnalyƟcs/Monitoring
Availability/Resiliency
Cost Comparison
Deployment
FuncƟonality/Design
Performance
NA
SaaS
PaaS
IaaS
OnPremise
Scalability
Security
Test Technique
Fig. 7. Operational area vs service type.
Fig. 8. Implementation of solutions.
A Systematic Literature Review on Microservices 211
Only Swagger is used for microservice markup language. It is interesting to see that
WADL or API Blueprint is not mentioned.
The occurrence of tools used in proposed or implemented solutions can be found in
Fig. 10. Docker is seen as the most frequently used tool in studies.
The microservices topic is new and the official research started to show up in
research papers in 2015. As a result, it is expected for the number of research on
microservices to increase over time. Figure 11 shows publication numbers over time.
The last search was carried out on the Web of Science in January 2017. On the figure,
Fig. 9. Emerging standards
Fig. 10. Common tools used for implementing microservices
212 H. Vural et al.
the line shows the trend. It is seen that the amount of papers increases radically and the
trend line is going up.
6 Conclusions and Future Work
The term microservices was first appeared in 2014. All academic papers about
microservices belong to 2015 and 2016. From that, we conclude that it is completely a
new topic.
Considering the mapping results, we can conclude that microservices is a trending
topic and our prediction is that we will see increasing trend in the near future.
Another important conclusion that we draw from the systematic mapping is that
there are not enough empirical studies to clarify many issues under discussion related to
microservices. Also, there is no research specifically targeting the fragile points of
microservices such as distributed transactions.
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A Systematic Literature Review On Microservices

  • 1. A Systematic Literature Review on Microservices Hulya Vural, Murat Koyuncu(&) , and Sinem Guney Atilim University, Ankara, Turkey hulya.vural.tr@gmail.com,sinemmguney@gmail.com, mkoyuncu@atilim.edu.tr Abstract. The cloud is an emerging paradigm which leads the way for different approaches and standards. The architectural styles are evolving based on the requirements of the cloud as well. In recent years microservices is seen as the architecture style for scalable, fast evolving cloud applications. As part of this paper, a systematic mapping study was carried out around microservices. It is aiming to find out the current trends around microservices, the motivation behind microservices research, emerging standards and the possible research gaps. The obtained results can help researchers and practitioner in software engineering domain who want to be aware of new trends about SOA and cloud computing. Keywords: Cloud SOA Web services Microservices Systematic mapping 1 Introduction Service-oriented architecture (SOA) has emerged as a means of developing distributed systems where the components are stand-alone services [37]. Services are basic units which are developed independently and made accessible over the Internet. Standard internet protocols are used for service communication among different computers. SOA provides many advantages to develop easy and economic distributed software systems and, therefore, it is the leading technology for interoperability on today’s internet world. Service-oriented software engineering defines evolution of existing software engineering approaches to develop dependable and reusable services considering the requirements and characteristics of this technology [37]. Service-oriented computing (SOC) is the paradigm that utilizes services as the fundamental elements for developing applications. Therefore, service-oriented software engineering aims at designing and developing service-based applications consonant with SOC paradigm and SOA prin- ciples using software engineering methodologies. After the popularity of cloud computing in recent years, new trends in the software engineering have emerged, such as going to market with minimal viable product and making small development teams autonomous. The architectural styles have also evolved based on the cloud environment needs [36]. One of those new architectural styles is microservices. The aim of the microservices is to divide the business behavior into small services which can run independent of each other. As mentioned by Martin © Springer International Publishing AG 2017 O. Gervasi et al. (Eds.): ICCSA 2017, Part VI, LNCS 10409, pp. 203–217, 2017. DOI: 10.1007/978-3-319-62407-5_14
  • 2. Fowler, “While there is no precise definition of this architectural style, there are certain common characteristics around organization around business capability, automated deployment, intelligence in the endpoints, and decentralized control of languages and data” [1]. Another definition for microservices is “Microservices are small, autonomous services that work together” [2]. The characteristics of the microservices are listed as follows [1]: • Componentization via Services • Organized around Business Capabilities • Products not Projects • Smart endpoints and dumb pipes • Decentralized Governance • Decentralized Data Management • Infrastructure Automation • Design for failure • Evolutionary Design The microservices are developed, deployed and maintained separately. This allows the teams to be autonomous where they can decide on the technology to use which best addresses the current needs of the business behavior. The language and the database might be different from one microservice to another. They do not share data between each other, instead they use Representational State Transfer (REST) protocol to communicate to each other. The most important benefits of using microservices are agility, autonomy, scalability, resilience and easy continuous deployment. Even though microservices were first mentioned at [60] in 2010, the definition of the microservice mentioned in that study does not totally map to the current microservice definition in literature. The study carried out in 2010 [60] defines microservices as light services using REST. It does not mention most of the charac- teristics listed at [1]. There has been another systematic mapping carried out on microservices in 2016 [40]. In that study, the research questions are around the architectural diagrams used for microservices’ representation, the quality attributes and the challenges. However, the emerging standards and de facto tools are not mentioned. In this paper, the aim is to not only analyze the emerging standards but also the types of research conducted and the practical motivations around carrying out the microservices architecture. 2 Method This study is conducted a systematic mapping as defined in [3] with one modification (see Fig. 1). The modification is that, we carry out the keywording according to the whole paper instead of keywording according to the abstract. The reason for the modification to the original process is to enhance the classification criteria through adding new areas. 204 H. Vural et al.
  • 3. 2.1 Research Questions Three research questions are determined as follows: RQ1: What type of research is conducted on microservices? RQ2: What are the main practical motivations behind microservices related research? RQ3: What are the emerging standards and de facto tools on microservices solutions? 2.2 Search Sampling The search is conducted using Web of Science (Thomson Reuters Web of Knowledge), which includes the following online databases: • ACM (Association for Computing Machinery) Digital Library [4] • CiteSeer [5] • Computer Source [6] • ebrary [7] • Human-Computer Interaction Bibliography [8] • IEEE Xplore [9] • INSPEC [10] • INSPEC Archive [11] • Nature [12] • Science [13] • Science Technology Collection [14] • SciTech Connect [15] • Springer LINK [16] 2.3 Search Iteration The search is carried on with the following criteria: • Keywords: microservice OR micro-service • Research Area: Computer Science The search iteration has returned 39 results [17–32, 38–60]. Fig. 1. Process steps and outcomes A Systematic Literature Review on Microservices 205
  • 4. 3 Screening the Papers The papers are evaluated according to the inclusion and exclusion criteria. The ones which do not meet the criteria are excluded. The inclusion criteria: • All papers returned from the search criteria Exclusion criteria: • If the microservices is just mentioned in the research but the focus of the research is not directly on microservices. Out of 39, 2 papers were excluded based on the exclusion criteria [30, 41]. As a result, 37 papers are included into the mapping process. 4 Keywording As part of keywording four different categorization schemes are identified: • Service models in cloud computing • Operational areas • Research types • Emerging standards and tools. 4.1 Service Models in Cloud Computing The service models in cloud computing are classified in three different types [33]: • Infrastructure as a Service (IaaS): the infrastructure is supplied as a service (e.g. virtual machine, hard disk, load balancer etc.). • Platform as a Service (PaaS): The platform is supplied as a service (e.g. Azure SQL, Tomcat etc.). • Software as a Service (SaaS): The software itself is supplied as a service (e.g. Office 365, Gmail etc.). Even though the microservice architecture style is shaped considering cloud needs, the research papers returned as part of the search criteria do not necessarily use cloud. As a result, on premise installations (OnPrem) are also included in the service models. 4.2 Operational Areas In [34] several different operational areas are called out for cloud: • Accounting and billing • SLA management (Service Level Agreement) • Service/resource provisioning 206 H. Vural et al.
  • 5. • Capacity planning • Configuration management • Security and privacy assurance • Fault management Some of the research papers included in the current study are focusing on cloud whereas some are not. As a result, the operational areas were modified to fit the needs as follows: • Cost comparison • Availability/Resiliency • Performance • Security • Test technique • Functionality/Design • Analytics/Monitoring • Scalability • Deployment The answer for the second research question (RQ2) will be based on the modified operational areas. 4.3 Research Types In [35], 6 different research types are called out (See Table 1). The answer to the first research question (RQ1) will be based on these 6 research types. 4.4 Emerging Standards and Tools The papers included in this systematic mapping study can be seen as a representation of the common tools used for microservices. Given that microservices is a new concept, the standards are not yet well formed. The current systematic study aims also to give an answer on emerging standards for microservices. 5 Data Extraction and Mapping The results obtained from mapping are converted into different graphs and they are given below in a way to answer the defined research questions. RQ1: What type of research is conducted on microservices? The papers are mapped to the research types as seen in Fig. 2. The most widely used research type is Solution Proposal which is followed by Validation Research and Evaluation Research. The papers are classified according to the service types as seen in Fig. 3. Almost half of the papers did not explicitly mention the service type they were targeting A Systematic Literature Review on Microservices 207
  • 6. (represented as NA in the figure). SaaS by far the most common service type being investigated. Also, some papers refer to more than one service type. The bubble chart in Fig. 4 illustrates an analysis based on research types versus service types. The figure shows that there are only two studies on IaaS investigation regarding microservices. This is an expected outcome given that the microservices is a high level architectural style. On the other hand, there is only one official philosophical research papers on microservices. Most probably the reason is that the philosophical Table 1. Research types Class Description Validation research Techniques investigated are novel and have not yet been implemented in practice. Techniques used are for example experiments, i.e., work done in the lab Evaluation research Techniques are implemented in practice and an evaluation of the technique is conducted. That means, it is shown how the technique is implemented in practice (solution implementation) and what are the consequences of the implementation in terms of benefits and drawbacks (implementation evaluation). This also includes identification of problems in industry Solution proposal A solution for a problem is proposed, the solution can be either novel or a significant extension of an existing technique. The potential benefits and the applicability of the solution is shown by a small example or a good line of argumentation Philosophical papers These papers sketch a new way of looking at existing things by structuring the field inform of a taxonomy or conceptual framework Opinion papers These papers express the personal opinion of somebody whether a certain technique is good or bad, or how things should have been done. They do not rely on related work and research methodologies Experience papers Experience papers explain what and how something has been done in practice. It has to be the personal experience of the author Fig. 2. Research types 208 H. Vural et al.
  • 7. statement of microservices was laid out by Lewis and Fowler [1] on 2014. Mostly, the research is around Solution Proposal which do not explicitly call out the possible service types applicable for that solution. RQ2: What are the main practical motivations behind microservices related research? The papers are mapped to the operational areas and obtained results are shown in Fig. 5. The main motives are around functionality followed by performance and test techniques. Given that the microservices paradigm was first mentioned around 2014 and official research papers started to show up in 2015, it is natural to expect the functionality be main concerns of research. Fig. 3. Count of papers per service type Research Type vs Service Type Philosophical Paper Opinion Paper Personal Experience Proposal of SoluƟon EvaluaƟon Research ValidaƟon Research NA SaaS PaaS IaaS OnPremise Fig. 4. Service types versus research types A Systematic Literature Review on Microservices 209
  • 8. Figure 6 aims to answer if the study has empirical results or not. Our analysis shows that the empirical studies are currently small in amount. Figure 7 illustrates an analysis based on operational areas versus service types. The most remarkable point is that most of the studies focus on the functionality/design issues. Figure 8 shows if there is a new solution proposed and/or implemented. As seen in the figure, most of the Fig. 5. Operational areas Fig. 6. Empirical results in research 210 H. Vural et al.
  • 9. research propose new solutions. Another noticeable point is that the implementation ratio of new solutions is higher than the implementation ratio of existing solutions. RQ3: What are the emerging standards and de facto tools on microservices solutions? The occurrence of standards proposed or implemented in the research papers included into the systematic mapping can be seen in Fig. 9. The figure includes all the standards either implemented or proposed in systematic mapping papers. As clearly seen in the figure, REST can be called out as the standard for Microservices, even though there is one outlier paper which used non-REST protocol in their study [28]. OperaƟonal Area vs Service Type AnalyƟcs/Monitoring Availability/Resiliency Cost Comparison Deployment FuncƟonality/Design Performance NA SaaS PaaS IaaS OnPremise Scalability Security Test Technique Fig. 7. Operational area vs service type. Fig. 8. Implementation of solutions. A Systematic Literature Review on Microservices 211
  • 10. Only Swagger is used for microservice markup language. It is interesting to see that WADL or API Blueprint is not mentioned. The occurrence of tools used in proposed or implemented solutions can be found in Fig. 10. Docker is seen as the most frequently used tool in studies. The microservices topic is new and the official research started to show up in research papers in 2015. As a result, it is expected for the number of research on microservices to increase over time. Figure 11 shows publication numbers over time. The last search was carried out on the Web of Science in January 2017. On the figure, Fig. 9. Emerging standards Fig. 10. Common tools used for implementing microservices 212 H. Vural et al.
  • 11. the line shows the trend. It is seen that the amount of papers increases radically and the trend line is going up. 6 Conclusions and Future Work The term microservices was first appeared in 2014. All academic papers about microservices belong to 2015 and 2016. From that, we conclude that it is completely a new topic. Considering the mapping results, we can conclude that microservices is a trending topic and our prediction is that we will see increasing trend in the near future. Another important conclusion that we draw from the systematic mapping is that there are not enough empirical studies to clarify many issues under discussion related to microservices. Also, there is no research specifically targeting the fragile points of microservices such as distributed transactions. References 1. Lewis, J., Fowler, M.: “Microservices” martinfowler.com. http://martinfowler.com/articles/ microservices.html. Accessed 20 Dec 2016 2. Newman, S.: Building Microservices. O’Reilly Media, Inc., Sebastopol (2015) 3. Petersen, K., Feldt, R., Mujtaba, S., Mattsson, M.: Systematic mapping studies in software engineering. In: 12th International Conference on Evaluation and Assessment in Software Engineering, vol. 17, p. 1 (2008) 4. Dl.acm.org: ACM Digital Library (2016). http://dl.acm.org/dl.cfm. Accessed 05 Jan 2016 5. Citeseerx.ist.psu.edu: CiteSeerX (2016). http://citeseerx.ist.psu.edu/. Accessed 05 Jan 2016 6. Search.ebscohost.com: Computer Source (2016). http://search.ebscohost.com/login.aspx? authtype=ip,uidprofile=ehostdefaultdb=cph. Accessed 05 Jan 2016 Fig. 11. Number of microservices papers over time without applying exclusion criteria (searched on January 20, 2017) A Systematic Literature Review on Microservices 213
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