R. Xiang, J. Neville, und M. Rogati. Proceedings of the 19th international conference on World wide web, Seite 981--990. New York, NY, USA, ACM, (2010)
R. Xiang, J. Neville, und M. Rogati. Proceedings of the 19th international conference on World wide web, Seite 981--990. New York, NY, USA, ACM, (2010)