E. Chi, and T. Mytkowicz. HT '08: Proceedings of the nineteenth ACM conference on Hypertext and hypermedia, page 81--88. New York, NY, USA, ACM, (2008)
R. Madsen, S. Sigurdsson, L. Hansen, and J. Larsen. Pattern Recognition, 2004. ICPR 2004. Proceedings of the 17th International
Conference on, (23-26 Aug. 2004)
B. Hu, S. Dasmahapatra, P. Lewis, and N. Shadbolt. Tools with Artificial Intelligence, 2003. Proceedings. 15th IEEE
International Conference on, page 77--82. (2003)