R. Hutchinson, L. Liu, and T. Dietterich. Proceedings of the Twenty-Fifth AAAI Conference on Artificial Intelligence, page 1343--1348. Association for the Advancement of Artificial Intelligence, (2011)
S. Lee, and D. Kim. Proceedings of the Ninth International Conference on Machine Learning and Applications (ICMLA), page 767 --770. Washington, DC, (December 2010)