D. Mladenic, and M. Grobelnik. ICML '99: Proceedings of the Sixteenth International Conference on Machine Learning, page 258--267. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (1999)
S. Owen, R. Anil, T. Dunning, and E. Friedman. Manning Publications Co., Manning Publications Co. 20 Baldwin Road PO Box 261 Shelter Island, NY 11964, First edition, (2011)