Kenneth Baclawski Christopher J. Matheus Mieczyslaw M. Kokar Jerzy Letkowski Paul A. Kogut Towards a Symptom Ontology for Semantic Web Applications. 650-667 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3298&spage=650 2004 conf/semweb/2004 International Semantic Web Conference db/conf/semweb/iswc2004.html#BaclawskiMKLK04