On October 23rd, 2014, we updated our
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O’Sullivan et al. (2000) “Using desktop GIS for the investigation of accessibility by public
transport: an isochrone approach”, int. j. geographical information science, 2000, vol. 14, no. 1,
Gatrell, A. (1983) “Distance and Space: A Geographical Perspective”, Oxford Oxfordshire and
New York: Clarendon Press