db/conf/gis/FonsecaE99.html Frederico T. Fonseca Max J. Egenhofer Ontology-Driven Geographic Information Systems. 14-19 GIS1999/P014.pdf 1999 conf/gis/99 ACM-GIS http://doi.acm.org/10.1145/320134.320137 db/conf/gis/gis99.html#FonsecaE99