J. Turian, L. Ratinov, and Y. Bengio. Proceedings of the 48th Annual Meeting of the Association for Computational Linguistics, page 384--394. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)
D. Lewis. Proceedings of ECML-98, 10th European Conference on Machine Learning, 1398, page 4--15. Chemnitz, DE, Springer Verlag, Heidelberg, DE, (1998)