Liane Gabora Diederik Aerts Contextualizing concepts using a mathematical generalization of the quantum formalism. 327-358 2002 14 J. Exp. Theor. Artif. Intell. 4 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=0952-813x&volume=14&issue=4&spage=327 db/journals/jetai/jetai14.html#GaboraA02