Z. Toups, A. Kerne, W. Hamilton, и A. Blevins. Proceedings of the ACM 2009 International Conference on Supporting Group Work, стр. 341--350. New York, NY, USA, ACM, (2009)
Z. Toups, A. Kerne, W. Hamilton, и N. Shahzad. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, стр. 1959--1968. New York, NY, USA, ACM, (2011)