R. Capra, G. Marchionini, J. Oh, F. Stutzman, and Y. Zhang. JCDL '07: Proceedings of the 7th ACM/IEEE-CS joint conference on Digital libraries, page 442--451. New York, NY, USA, ACM, (2007)
A. Kittur, E. Chi, and B. Suh. Proceedings of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 453--456. New York, NY, USA, ACM, (2008)
P. Isenberg, A. Tang, and S. Carpendale. Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, page 1217--1226. New York, NY, USA, ACM, (2008)
L. Findlater, and J. Mcgrenere. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, page 1247--1256. New York, NY, USA, ACM, (2008)