1. Modeling spatial knowledge;Kuipers;Cognitive Science,1978
2. Epistomological problems of artificial intelligence;McCarthy;IJCAI-77,1977
3. A hybrid spatial/object-oriented DBMS to support automated spatial, hierarchical, and temporal reasoning;Antony,1990
4. A cognitive model for a “smart” geographic information system;Piazza,1990
5. The National Science Foundation National Center for Geographic Information and Analysis;Abler;International Journal of Geographical Information Systems,1987