A. Plangprasopchok, und K. Lerman. WWW '09: Proceedings of the 18th international conference on World wide web, Seite 781--790. New York, NY, USA, ACM, (2009)
P. Turney. ACL-44: Proceedings of the 21st International Conference on Computational Linguistics and the 44th annual meeting of the Association for Computational Linguistics, Seite 313--320. Morristown, NJ, USA, Association for Computational Linguistics, (2006)