Rudolf Wille Why can concept lattices support knowledge discovery in databases? 81-92 2002 14 J. Exp. Theor. Artif. Intell. 2-3 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=0952-813x&volume=14&issue=2&spage=81 db/journals/jetai/jetai14.html#Wille02