L. Nelson, C. Held, P. Pirolli, L. Hong, D. Schiano, and E. Chi. Proceedings of the 27th international conference on Human factors in computing systems, page 1795--1798. New York, NY, USA, ACM, (2009)
L. Nelson, C. Held, P. Pirolli, L. Hong, D. Schiano, and E. Chi. Proceedings of the 27th international conference on Human factors in computing systems, page 1795--1798. New York, NY, USA, ACM, (2009)