M. Dredze, T. Lau, and N. Kushmerick. IUI '06: Proceedings of the 11th international conference on Intelligent user interfaces, page 70--77. New York, NY, USA, ACM, (2006)
S. Tucker, O. Bergman, A. Ramamoorthy, and S. Whittaker. CSCW '10: Proceedings of the 2010 ACM conference on Computer supported cooperative work, page 99--102. New York, NY, USA, ACM, (2010)