Z. Zheng, G. Webb, и K. Ting. Proceedings of the Sixteenth International Conference on Machine Learning (ICML-99), стр. 493-502. San Francisco, Morgan Kaufmann, (1999)
M. Viswanathan, и G. Webb. Lecture Notes in Computer Science 1398: Proceedings of the Tenth European Conference on Machine Learning (ECML'98), стр. 149-159. Berlin/Heidelberg, Springer, (1998)