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Note: Links lead to the DBLP on the Web. Anders Friis-Christensen 2 Anders Friis-Christensen, Nectaria Tryfona , Christian S. Jensen : Requirements and Research Issues in Geographic Data Modeling. ACM-GIS 2001 : 2-8 1 Christian S. Jensen , Anders Friis-Christensen, Torben Bach Pedersen , Dieter Pfoser , Simonas Saltenis , Nectaria Tryfona : Location-based services: A database perspective. ScanGIS 2001 : 59-68 ![]() DiSC'02 © 2003 Association for Computing Machinery |