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E. Baykan, M. Henzinger, L. Marian, und I. Weber. Proceedings of the 18th International Conference on World Wide Web, Seite 1109--1110. New York, NY, USA, ACM, (2009)
M. Kan, und H. Thi. Proceedings of the 14th ACM International Conference on Information and Knowledge Management, Seite 325--326. New York, NY, USA, ACM, (2005)