José Mira Ana E. Delgado García Maria Taboada Neurosymbolic Integration: The Knowledge Level Approach. 460-470 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2809&spage=460 2003 conf/eurocast/2003 EUROCAST db/conf/eurocast/eurocast2003.html#MiraGT03