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ISSN:1545-0465|18|2|104-108

Cartography and Geographic Information Society‎(1991)‎

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By Ratner David   Reiher Peter   Popek Gerald J.   in Mobile Networks and Applications

ISSN:1383-469X|9|5|537-544

Springer Publishing Company ‎(2004)‎

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By Elsby Michael W. L.   Michaels Ryan   Ratner David   in Journal of Economic Literature

ISSN:0022-0515|53|3|571-630

American Economic Association‎(2015)‎

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