1. NLP found helpful (at least for one text categorization task) McKeown, Kathleen; Sable, Carl; Church, Kenneth W. 2002 Presentations (Communicative Events) Information technologyComputer science
2. Using Bins to Empirically Estimate Term Weights for Text Categorization Sable, Carl; Church, Kenneth W. 2001 Presentations (Communicative Events) Computer scienceInformation technology