Richard Holzer Knowledge Acquisition under Incomplete Knowledge using Methods from Formal Concept Analysis: Part II. 41-63 2004 63 Fundam. Inform. 1 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=63&issue=1&spage=41 db/journals/fuin/fuin63.html#Holzer04a