E. Breck, Y. Choi, и C. Cardie. IJCAI'07: Proceedings of the 20th International Joint Conference on Artifical Intelligence, стр. 2683--2688. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2007)
T. Mullen, и N. Collier. Proceedings of the Conference on Empirical Methods in Natural Language Processing (EMNLP), стр. 412--418. (июля 2004)Poster paper.