T. Bell, P. Curzon, Q. Cutts, V. Dagiene, and B. Haberman. Proceedings of the 16th annual joint conference on Innovation and technology in computer science education, page 391--391. New York, NY, ACM, (2011)
C. Daskalakis, P. Goldberg, and C. Papadimitriou. STOC '06: Proceedings of the thirty-eighth annual ACM symposium on Theory of computing, page 71--78. New York, NY, USA, ACM, (2006)
P. Kabbash, S. Mackenzie, and W. Buxton. CHI '93: Proceedings of the SIGCHI conference on Human factors in computing systems, page 474--481. New York, NY, USA, ACM Press, (1993)