D. Cosley, D. Frankowski, L. Terveen, and J. Riedl. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, page 1037--1046. New York, NY, USA, ACM Press, (2006)
M. Toyoda, and M. Kitsuregawa. HYPERTEXT '01: Proceedings of the twelfth ACM conference on Hypertext and Hypermedia, page 103--112. New York, NY, USA, ACM Press, (2001)
G. Flake, S. Lawrence, and L. Giles. KDD '00: Proceedings of the sixth ACM SIGKDD international conference on Knowledge discovery and data mining, page 150--160. New York, NY, USA, ACM Press, (2000)