Lars Schoolmann Triadic Concept Graphs and Their Conceptual Contents. 285-298 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3403&spage=285 2005 conf/icfca/2005 ICFCA db/conf/icfca/icfca2005.html#Schoolmann05