Belkin, N.J., Keller, A., Kelly, D. Perez-Carballo, J., Sikora, C., Sun, Y. (2001) Support for Question-Answering in Interactive Information Retrieval: Rutgers’ TREC-9 Interactive Track Experience. In E. M. Voorhees & D.K. Harman (Eds.) The Ninth Text Retrieval Conference (TREC-9) (pp. 463-473). Washington, DC: GPO.