Z. Gyöngyi, H. Garcia-Molina, und J. Pedersen. Proceedings of the Thirtieth international conference on Very large data bases - Volume 30, Seite 576--587. VLDB Endowment, (2004)
C. Castillo, D. Donato, A. Gionis, V. Murdock, und F. Silvestri. Proceedings of the 30th annual international ACM SIGIR conference on Research and development in information retrieval, Seite 423--430. New York, NY, USA, ACM, (2007)
Y. Ahn, S. Han, H. Kwak, S. Moon, und H. Jeong. WWW '07: Proceedings of the 16th international conference on World Wide Web, Seite 835--844. New York, NY, USA, ACM, (2007)