C. Firan, W. Nejdl, and R. Paiu. Proceedings of the 2007 Latin American Web Conference (LA-WEB), page 32-41. Washington, DC, USA, IEEE Computer Society, (2007)
D. Ramage, P. Heymann, C. Manning, and H. Garcia-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)