J. Chen, W. Geyer, C. Dugan, M. Muller, and I. Guy. Proceedings of the 27th international conference on Human factors in computing systems, page 201--210. New York, NY, USA, ACM, (2009)
E. Gilbert, and K. Karahalios. Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, page 211--220. New York, NY, USA, ACM, (2009)
Y. Wang, J. Zhang, and J. Vassileva. Artificial Intelligence: Methodology, Systems, and Applications, volume 6304 of Lecture Notes in Computer Science, chapter 7, Springer Berlin / Heidelberg, Berlin, Heidelberg, (2010)