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J. Zhang, and M. Ackerman. Proceedings of the 2005 international ACM SIGGROUP conference on Supporting group work, page 71-80. Sanibel Island, Florda, ACM Press, (2005)
J. Freyne, R. Farzan, P. Brusilovsky, B. Smyth, and M. Coyle. IUI '07: Proceedings of the 12th international conference on Intelligent user interfaces, page 52--61. New York, NY, USA, ACM Press, (2007)