Y. Jo, C. Lagoze, and C. Giles. KDD '07: Proceedings of the 13th ACM SIGKDD international conference on Knowledge discovery and data mining, page 370--379. New York, NY, USA, ACM, (2007)
G. Flake, S. Lawrence, and C. 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, (2000)