E. Chi, and T. Mytkowicz. HT '08: Proceedings of the nineteenth ACM conference on Hypertext and hypermedia, page 81--88. New York, NY, USA, ACM, (2008)
J. Zhang, M. Ackerman, and L. Adamic. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 221--230. New York, NY, USA, ACM, (2007)
M. Keith, H. Demirkan, and M. Goul. HICSS '07: Proceedings of the 40st Annual Hawaii International Conference on System Sciences, 0, page 215b. Los Alamitos, CA, USA, IEEE Computer Society, (2007)