R. White, M. Richardson, and Y. Liu. Proceedings of the 2011 annual conference on Human factors in computing systems, page 2837--2846. New York, NY, USA, ACM, (2011)
O. Boydell, and B. Smyth. IUI '07: Proceedings of the 12th international conference on Intelligent user interfaces, page 42--51. New York, NY, USA, ACM Press, (2007)
C. Lampe, N. Ellison, and C. Steinfield. CSCW '06: Proceedings of the 2006 20th anniversary conference on Computer supported cooperative work, page 167--170. New York, NY, USA, ACM Press, (2006)
F. Lawrence, and Schraefel. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 153--162. New York, NY, USA, ACM Press, (2006)
D. Zhou, E. Manavoglu, J. Li, L. Giles, and H. Zha. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 173--182. New York, NY, USA, ACM Press, (2006)