R. Baeza-Yates, C. Hurtado, и M. Mendoza. Current Trends in Database Technology - EDBT 2004 Workshops, том 3268 из Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2005)
Y. Duan, L. Jiang, T. Qin, M. Zhou, и H. Shum. Proceedings of the 23rd International Conference on Computational Linguistics, стр. 295--303. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)