A. Plangprasopchok, K. Lerman, and L. Getoor. Proceedings of the 16th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 949--958. New York, NY, USA, ACM, (2010)
M. Hearst. Proceedings of the 14th conference on Computational linguistics, 2, page 539--545. Stroudsburg, PA, USA, Association for Computational Linguistics, (1992)