P. Heymann, D. Ramage, and H. Garcia-Molina. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 531--538. New York, NY, USA, ACM, (2008)
D. Ramage, P. Heymann, C. Manning, and H. Molina. Proceedings of the Second ACM International Conference on Web Search and Data Mining, page 54--63. New York, NY, USA, ACM, (2009)
D. Ramage, P. Heymann, C. Manning, and H. Molina. WSDM '09: Proceedings of the Second ACM International Conference on Web Search and Data Mining, page 54--63. New York, NY, USA, ACM, (2009)