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- [3] DATA CONVERSION PROCESSES FOR GEOGRAPHIC INFORMATION-SYSTEMS TECHNICAL PAPERS : 1989 ASPRS/ACSM ANNUAL CONVENTION, VOL 4: GIS/LIS, 1989, : 21 - 29
- [5] A REACTIVE DATA STRUCTURE FOR GEOGRAPHIC INFORMATION-SYSTEMS AUTO CARTO 9 : NINTH INTERNATIONAL SYMPOSIUM ON COMPUTER-ASSISTED CARTOGRAPHY, 1989, : 665 - 674
- [6] PERSPECTIVES ON SHARING DATA IN GEOGRAPHIC INFORMATION-SYSTEMS PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING, 1992, 58 (11): : 1557 - 1560
- [9] GEOGRAPHIC INFORMATION-SYSTEMS 2ND PACIFIC CONFERENCE : NEW INFORMATION TECHNOLOGY: FOR LIBRARY & INFORMATION PROFESSIONALS, EDUCATIONAL MEDIA SPECIALISTS & TECHNOLOGISTS, 1989, : 197 - 202