S. Bateman, C. Gutwin, and M. Nacenta. Proceedings of the nineteenth ACM conference on Hypertext and hypermedia, page 193--202. New York, NY, USA, ACM, (2008)
S. Bloehdorn, O. G�rlitz, S. Schenk, and M. V�lkel. Proceedings of I-KNOW. 6th International Conference on Knowledge
Management., page 304-312. Journal of Universal Computer Science, (2006)
S. Farrell, T. Lau, E. Wilcox, S. Nusser, and M. Muller. UIST '07: Proceedings of the 20th annual ACM symposium on User interface
software and technology, page 91--100. New York, NY, USA, ACM, (2007)