Timothy Read Elena Bárcena Beatriz Barros M. Felisa Verdejo Adaptive modelling of student diagnosis and material selection for on-line language learning. 135-149 2002 12 Journal of Intelligent and Fuzzy Systems 3-4 http://iospress.metapress.com/openurl.asp?genre=article&issn=1064-1246&volume=12&issue=3&spage=135 db/journals/jifs/jifs12.html#ReadBBV02