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N. Kaplan, and Y. Chisik. JCDL '05: Proceedings of the 5th ACM/IEEE-CS joint conference on Digital libraries, page 235--243. New York, NY, USA, ACM Press, (2005)
G. Golovchinsky, M. Price, and B. Schilit. SIGIR '99: Proceedings of the 22nd annual international ACM SIGIR conference on Research and development in information retrieval, page 19--25. New York, NY, USA, ACM Press, (1999)
J. Klerkx, E. Duval, and M. Meire. IV '04: Proceedings of the Information Visualisation, Eighth International Conference on (IV'04), page 465--470. Washington, DC, USA, IEEE Computer Society, (2004)