A. Hotho, S. Staab, and G. Stumme. Knowledge Discovery in Databases: PKDD 2003, 7th European Conference on Principles and Practice of Knowledge Discovery in Databases, volume 2838 of LNAI, page 217-228. Heidelberg, Springer, (2003)
D. Milne, O. Medelyan, and I. Witten. ACM International Conference on Web Intelligence (WI 2006 Main Conference Proceedings)(WI'06), page 442--448. (2006)