J. Chen, R. Nairn, L. Nelson, M. Bernstein, and E. Chi. CHI '10: Proceedings of the 28th international conference on Human factors in computing systems, page 1185--1194. New York, NY, USA, ACM, (2010)
C. Haruechaiyasak, M. Shyu, and S. Chen. Proceedings of the IEEE International Conference on Information Reuse
and Integration (IRI), page 357--362. (2004)