E-CAST: A Data Mining Algorithm for Gene Expression Data. - Abdelghani Bellaachia; David Portnoy; Yidong Chen 002; Abdel G. Elkahloun (BIOKDD, 2002)

Unsupervised Fuzzy-Membership Estimation of Terms in Semantic and Syntactic Lexical Classes. - David Portnoy; Peter Bock (AIPR, 2004)

Automatic extraction of the multiple semantic and syntactic categories of words. - David Portnoy; Peter Bock (Artificial Intelligence and Applications, 2007)