Hyunjang Kong Kwanho Jung Junho Choi Wonpil Kim PanKoo Kim Jong-An Park Representing the Spatial Relations in the Semantic Web Ontologies. 77-87 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2903&spage=77 2003 conf/ausai/2003 Australian Conference on Artificial Intelligence db/conf/ausai/ausai2003.html#KongJCKKP03