The document discusses CrossRef Cited-by Linking, which allows publishers to see who is citing their publications by linking references deposited with CrossRef to the cited articles. Nearly 400 CrossRef members participate. Publishers can deposit references and query for cited-by links using XML, HTTP, or OAI-PMH. Depositing references allows an article's references to be linked to citing articles, while querying retrieves a list of articles that cite a given publication. Participation is optional for members, who must deposit references from current content to retrieve citing links.

1. CrossRef Cited-by Linking Webinar
17 April 2014
Carol Anne Meyer, Business Development & Marketing
cmeyer@crossref.org
@meyercarol

2. Today’s Agenda
• What is CrossRef Cited-by Linking?
• How Does it Look? Some Examples
• Who is Involved?
• What Does it Cost?
• How Does it Work?
• What do Publishers Have to Do?
• Questions

3. What is CrossRef Cited-by Linking?
A way to answer the
question:
“Who’s Citing You?”• An optional reference linking
service of CrossRef
• Additional navigation for your
publication web site
• Demonstration to your
readers the relevance of your
content
• Added discoverability through
optional reference distribution
to CrossRef Affiliates

4. What is the Difference Between
CrossRef Cited-by Linking and Forward
Linking?
Nothing!
• We changed the
name a few years
ago.
• You will still see
references in the
schema to
“Forward Linking”
or “FL”.

5. What happens to a publisher’s
references?
It Depends on the
Publisher
• Can be included in
Enhanced
CrossRef Metadata
Services
• Can be included in
Open Reference
Citations

6. CrossRef Metadata Services Opt-out
To make sure CrossRef Affiliates receive your
references, make sure not to opt-out of
references (This is the default)

7. How Does it Look? Some
Examples

12. How Does it Look?
Some Examples

14. Who participates?
Almost 400 CrossRef Members
394
0
50
100
150
200
250
300
350
400
450
2007 2008 2009 2010 2011 2012 2013 2014
# of CrossRef Cited-by Publishers

15. ABEAT - Associacao Brasileira de Especialistas em Alta Tecnologia * Advanced Research Journals * Agricultural History Society * Agricultural Institute of Canada * Air & Waste
Management Association * Akademiai Kiado * American Academy of Pediatrics * American Academy of Periodontology * American Association for the Advancement of Science
(AAAS) * American Association of Clinical Endocrinologists * American Chemical Society * American Economic Association * American Fisheries Society * American Geophysical
Union (AGU) * American Institute of Mathematical Sciences * American Institute of Physics (AIP) * American Journal of Pharmaceutical Education (AJPE) * American Marketing
Association * American Meteorological Society * American Pharmacists' Association * American Physical Society * American Psychiatric Publishing * American Society for Clinical
Investigation * American Society for Clinical Pathology * American Society for Microbiology * American Society of Hematology * American Society of Neuroradiology * American
Society of Plant Biologists * American Society of Tropical Medicine and Hygiene * American Statistical Association * Ammons Scientific * Annual Reviews * AOSIS OpenJournals
Publishing * Asia Pacific Association of Allergy, Asthma, and Clinical Immunology (APAAACI) * Associacao Portuguesa dos Recursos Hidricos (APRH) * Association for Career and
Technical Education Research * Association for Experiential Education * Association for Research in Vision & Ophthalmology (ARVO) * Association of Fire Ecology * Baskar *
Baywood Publishing Co., Inc. * BC Decker * Behaviormetric Society of Japan * Bellwether Publishing * BioInfoBank Institute * BioOne * BioScientifica * Botanic Garden and
Botanical Museum Berlin-Dahlem * Bulletin of the Atomic Scientists * CAIRN * Cambridge University Press * Canadian Academic Accounting Association * Canadian Centre of
Academic Art and Science * Canadian Institute of Geomatics * Canadian Meteorological and Oceanographic Society * Canadian Science Publishing * Canadian Water Resources
Association * Carden Jennings Publishing Co. * Center for Psychiatric Rehabilitation * Centers for Diease Control and Prevention * CFA Institute * China Science Publishing Group
Co., Ltd. (Science Press) * Chinese Journal of Mechanical Engineering * CIG Media Group, LP * CLEO Revues.org * Co-Action Publishing * Consortia Academia Publishing *
CSIRO Publishing * Czech Geological Society * Czech Geological Survey * Czechoslovak TeX Users Group (CSTUG) * Dentaquest * Department of Biology, Bogor Agricultural
University * Department of Biomedical Imaging, University of Malaya * Dialogue and Discourse * Dietitians of Canada * Digital Science Press * Duncker & Humblot GmbH *
Ecological Society of America * Edinburgh University Press * EDP Sciences * Edward Elgar Publishing * El Profesional de la Informacion - EPI SCP * Electronics and
Telecommunications Research Institute (ETRI) * Elsevier * Emerald * English Literature in Transition * Environmental Health Perspectives * Equinox Publishing Ltd. * European
Journal of Chemistry * European Optical Society * EURP * Expert Reviews * Faculty of 1000 * Faculty of Physical Education and Sport, University of Banja Luka * Future Medicine
Ltd * Gemological Institute of America * Geological Society of America * Geophysical Center RAS * George Washington University * Green Theory & Praxis: The Journal of
Ecopedagogy * Growing Science * Grupo Comunicar * Guilford Publications, Inc. * Gunther Eysenbach (JMIR) / University Health Network) * Healthcare Bulletin * Heldref
Publications * Hindawi Publishing Corporation * Hogrefe & Huber * Image Processing On Line * Inderscience Publishers Ltd. * Indian Academy of Neurosciences * Indiana
University Press * Informa UK Limited * Insight Knowledge * Institute of Electrical & Electronics Engineers (IEEE) * Institute of Hematology, Catholic University * Institute of Organic
Chemistry & Biochemistry * Institute of Pure and Applied Physics * Institutional Investor Journals * International Association for Bridge and Structural Engineering (IABSE) *
International Association of Fire Safety Science (IAFSS) * International Dental Research * International Dose-Response Society * International Food Policy Research Institute
(IFPRI) * International Reading Association * International Society for Gerontechnology * International Union of Crystallography * International Union of Pure and Applied Chemistry
(IUPAC) * IODP * IOP Publishing * IP Publishing Ltd. * Is,Guc The Journal of Industrial Relations and Human Resources * IUCN * J. Ross Publishing, Inc. * Japan Science and
Technology Agency (JST) * Jaypee Brothers Medical Publishing * JMIR Publications Inc. * Journal of Chinese Integrative Medicine Press * Journal of Gambling Issues (CAMH) *
Journal of Human Sport and Exercise * Journal of Medical Internet Research * Journal of Neurosurgery Publishing Group (JNSPG) * Journal of Tropical Soils * Journal of Zhejiang
University SCIENCE * JSTOR * Korea Basic Science Institute * Korean Association of Medical Journal Editors (KAMJE) * Korean Institute of Science and Technology Information
(KISTI) * Korean Society for Microbiology and Biotechnology * Kowsar * Laser Pages Publishing LTD. * Libyan Journal of Medicine Society * Linkoping University Electronic Press *
Lithuanian Physical Society * Liverpool University Press * Logical Methods in Computer Science * M.E. Sharpe Inc. * MAFTREE * Mars Informatics * Mary Ann Liebert *
Mathematical Science Publishers * Medical Education Online * Medknow Publications * Men's Studies Press LLC. * Middle East Technical University, Faculty of Architecture * MIT
Press - Journals * ML CommunicationsCo., Ltd. * Monash University ePress * Morgan & Claypool Publishers LLC. * Mycotaxon, Ltd. * National Institute of Informatics * National
Library of Serbia * Nature Publishing Group * New England Journal of Medicine * New Leaf Associates, Inc. * Norwegian Society of Automatic Control * Nozomi Science * Oak
Ridge National Laboratory DAAC * OceanSide Publications * Oldenbourg Wissenschaft * OMICS Publishing Group * Oncology Nursing Society * Open Journals Publishing (African
Online Scientific Information Systems, Ltd) * Optical Society of America (OSA) * Ovid Technologies (Wolters Kluwer Health) * Oxford University Press * Pensoft Publishers *
Pharmacotherapy Publications, Inc. * Polish Botanical Society * Polska Akademia Nauk, Instytut Paleobiologii (Institute of Paleobiology, Polish Academy of Sciences) * Portland
Press Ltd. * Primary Care Respiratory Society UK * Proceedings of the National Academy of Sciences * Professional Engineering Publishing Limited * Public Library of Science *
Research Foundation of the CFA Institute * Revista Universo Contabil * Rockefeller University Press * Royal Irish Academy * Royal Society of Chemistry * S. Karger AG * Science
Alert * Science China Press., Co. Ltd. * Science Publications * Scientific Research Centre (ZRC SAZU) * Scientific Societies * ScopeMed International Medical Journal
Management and Indexing System * Smith School of Enterprise and the Environment * Sociedade Portuguesa de Vida Selvagem (SPVS) * Society for General Microbiology *
Society of Petroleum Engineers (SPE) * Sociological Research Online * Springer Publishing Company * Springer SBM * Stefan cel Mare University of Suceava * Steklov
Mathematical Institute * Surgisphere Corporation * Tamkang Journal of Math * The Company of Biologists * The Genomic Standards Consortium * The Journal of Solid Waste
Technology and Management * The Policy Press * The Royal Society * The Sedimentological Society of Japan * Thomas Land * Thomas Telford Publishing * Trans Tech
Publications AG * Transportation Research Board * Turk Ortopedi ve Travmatologi Dernegi * Turpion Ltd. * Ubiquity Press Ltd. * United Kingdom Serials Group (UKSG) * University
Nove de Julho - UNINOVE * University of California Press * University of Chicago Press * University of Toronto Press Inc. * University of Zagreb, Department of Mathematics *
Uspekhi Fizicheskikh Nauk (UFN) Journal * VBRI Press * Versita * Vilnius Gediminas Technical University * Wageningen Academic Publishers * Walsh Medical Media LLC. *
Walter de Gruyter * White Horse Press * Wiley-Blackwell * Woodhead Publishing Ltd. * World Bank * ZBW - German National Library of Economics *
http://www.crossref.org/citedby/index.html#publishers

16. Number of Articles with
References Deposited 21,540,177
Number of Cited-By Links 390,162,087
Number of CrossRef DOIs
with at least one Cited-by
link
26,889,355
% of CrossRef DOIs with at
least one Cited-by link
40%

17. What are the Rules?
• Participation is optional.
• Members must deposit references from
their current material to retrieve Cited-
by links.
• Members (or Affiliates acting on their
behalf) can retrieve Cited-by links to
display in Members’ primary content.
• Cited-by Linking is not available for
secondary publishers.

18. What if you want to be
really open?
• Members may deposit and distribute
unstructured references, but they don’t work
for Cited-by linking
• Members who want other publishers’
references need Enhanced CrossRef
Metadata Services at an additional fee
http://www.crossref.org/cms/index.html
• Members may make all of their reference
available to users of our UNIXML query
interface by emailing support@crossref.org

19. How Does it Work?
cites
Pub A
Pub B
Scenario #1
Pub A deposits DOI #11
2 Pub B deposits DOI #2 with
references—one cites DOI #1
DOI #2 cites DOI #1
3
Pub A queries CrossRef
“Who cites DOI #1?”
Pub A

20. How Does it Work?
Scenario #2
Pub A
Pub A deposits DOI #11
4 Stored Query Alert:
DOI #2 cites DOI #1
Pub A
Nobody
2 Pub A queries CrossRef
“Who cites DOI #1?”Pub A
3
Pub B
Pub B deposits DOI #2 with
references—one cites DOI #1
cites

21. What Do Publishers
Need to Do?
1.Sign up at
http://www.crossref.org/06members/citedby_linking_signup.html
2.Deposit reference lists for each
document at CrossRef
3.Query CrossRef (using the document
DOI) for a list of all DOIs citing a
document.

22. Depositing
References
• No special permission beyond CrossRef
account is required to make deposits

23. a) XML Reference Deposit
Deposit as many citations as
the article has,
but the list replaces whatever
was deposited before
Can include just a
DOI
Another optionUsed to line-up a return
match with a specific
query item

24. a) XML – Reference Deposit
<?xml version="1.0" encoding="UTF-8" ?>
<doi_citations_batch version="1.0.1"
xmlns="http://www.crossref.org/doi_citations_schema/3.0.3"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.crossref.org/doi_resources_schema/3.0.3
http://www.crossref.org/schema/deposit/crossref3.0.3.xsd">
<head>
<doi_batch_id>123456</doi_batch_id>
<depositor> … </depositor>
</head>
<body>
<doi_citations>
<doi>10.5555/small_md_0001</doi>
<citation_list>
<citation key="ref1">
<journal_title>Current Opinion in Oncology</journal_title>
<author>Chauncey</author>
<volume>13</volume>
<first_page>21</first_page>
<cYear>2001</cYear>
</citation>
<citation key="ref2">
<doi>10.5555/small_md_0001</doi>
</citation>
<citation key="ref3">
…
</citation>
</citation_list>
The DOI of the ‘citing’ article
A ‘cited’ tagged
reference
The DOI of a
‘cited’ reference

25. a) XML – Reference Deposit Results
<?xml version="1.0" encoding="UTF-8"?>
<doi_batch_diagnostic status="completed" sp="CR4">
<submission_id>334701547</submission_id>
<batch_id>04260730</batch_id>
<record_diagnostic status="Success">
<doi>10.5555/small_md_0001</doi>
<msg>Successfully updated</msg>
<citations_diagnostic>
<citation key="ref1" status="resolved_reference">
10.1016/0197-4580(90)90059-9
</citation>
<citation key="ref2" status="resolved_reference">10.5555/small_md_0001</citation>
<citation key="ref3" status="stored_query"></citation>
</citations_diagnostic>
</record_diagnostic>
<batch_data>
<record_count>1</record_count>
<success_count>1</success_count>
<warning_count>0</warning_count>
<failure_count>0</failure_count>
</batch_data>
</doi_batch_diagnostic>
The DOI of the ‘citing’ article

26. Hope for Smaller
Publishers
Coming soon: PDF Reference Extraction
Tools

27. b) Simple Text Query
Reference Deposit
http://www.crossref.org/SimpleTextQuery/

28. b) Simple Text Query
Reference Deposit
• The STQ form submits reference
deposits to the CR system
• You receive an e-mail with deposit
results

29. b) Simple Text Query
Reference Deposit
• The deposit will contain all the references STQ
can extract
• Parsed references that do not find a DOI
submitted as a stored metadata query
• References that do find a DOI submitted as
a DOI

30. b) Simple Text Query
Reference Deposit
• Each deposit will overwrite previous deposits
• Make each request a complete list of all
references
• Delete a reference by re-submitting deposit
without the reference

31. The DOI of the article containing
this reference
b) Simple Text Query
Reference Deposits
Paste in references
Get DOIs
Submit “Forward Link”

32. 2. Querying for Cited-by
Links
• A CrossRef user account must have
permission to submit Cited-by Linking
queries
• The CrossRef user can only retrieve
Cited-by links to articles “owned” by that
user’s prefix
• 3 ways to query
• XML
• HTTP
• OAI-PMH

33. <?xml version = "1.0" encoding="UTF-8"?>
<query_batch version="2.0" xmlns =
"http://www.crossref.org/qschema/2.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.crossref.org/qschema/2.0
http://www.crossref.org/qschema/crossref_query_input2.0.xsd">
<head>
<email_address>ckoscher@crossref.org</email_address>
<doi_batch_id>fl_001</doi_batch_id>
</head>
<body>
<fl_query alert=”true">
<doi>10.1103/PhysRev.100.935</doi>
</fl_query>
</body>
</query_batch>
set alert="true" if we want to receive future
emails when someone else cites this article
This is the DOI of the article that is
'cited’; We must be the owner to retrieve
any cited-by links
XML – Cited-by Query
Save as .xml file

34. Query
Sample

35. Upload XML Query

36. XML --Cited-by Query Results
• The article being cited
• # of times the citing
item is itself cited
• Pub type: full_text
/abstract
• DOI type: journal
article / book /
dissertation / …
• The DOI of the citing
item

37. ckoscher@crossref.org
Email alerts let you know when a new item cites your content.

38. HTTP Queries
The response to HTTP requests will also be formatted as XML
DOI query: This format retrieves all cited-by matches for a single DOI
within a specified date range:
http://doi.crossref.org/servlet/getForwardLinks?usr=<username>&pwd=
<password>&doi=<doi>&startDate=<startDate>&endDate=<endDate
By-date query: This format retrieves cited-by matches established on a
single day for a DOI prefix. Only the prefix owner may retrieve matches.
http://doi.crossref.org/servlet/getForwardLinks?usr=<username>&pwd=
<password>&doi=<prefix>&date=YYYY-MM-DD
Queries or large data may cause “504 Gateway Time-out error”

39. If the CrossRef system can't find a suitable match for a query, it returns a result of
"unresolved." In this case, you can resubmit the same query at a later time to see
whether the item you are seeking has been deposited (called polling).
To set the forward-match attribute, use this format:
<query key="key" forward-match="true/false">
You can also retrieve a list of stored queries that resolved within a specific date
range using the following URL:
/servlet/downloadStoredQueries?usr=<USERNAME>&pwd=<PASSWORD>&startDate=<FIR
STDATE>&endDate=<LASTDATE>
Storing Queries to Get Future Results

40. OAI-PMH Request to retrieve cited-by links
This format retrieves cited-by matches established within a date range for
a given title. Only the prefix owner may retrieve matches.
http://oai.crossref.org/OAIHandler?verb=ListRecords&usr=<username>
&pwd=<password>
&set=J10.5555&from=2011-11-01&until=2011-11-14
&metadataPrefix=cr_citedby
Some OAI-PMH requests are too big to be retrieved in a single
transaction. If a given response contains a resumption token the user
must make an additional request to retrieve the rest of the data.

41. OAI-PMH Results

42. Once retrieved, cited-by links should be included on DOI response pages.

43. Once retrieved, cited-by links should be included on DOI response pages.

44. http://help.crossref.org/
Help

45. Useful CrossRef Help Pages
• CrossRef Cited-by Linking Overview
http://help.crossref.org/#citedby_overview
• Depositing References
http://help.crossref.org/#depositing-references
• Querying for Cited-by References
http://help.crossref.org/#cited-by-linking
• Depositing and distributing references
http://help.crossref.org/#depositing-and-distributing-references
• About UNIXML
http://help.crossref.org/#unixref-query-result-format

46. Any Questions?

47. Technical Questions?
http://support.crossref.org or
support@crossref.org
Business Questions?
info@crossref.org