F. Suchanek, G. Ifrim, and G. Weikum. KDD '06: Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 712--717. New York, NY, USA, ACM Press, (2006)
Z. Nie, Y. Ma, S. Shi, J. Wen, and W. Ma. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 81--90. New York, NY, USA, ACM, (2007)
T. Cheng, X. Yan, and K. Chang. VLDB '07: Proceedings of the 33rd international conference on Very large data bases, page 387--398. VLDB Endowment, (2007)
R. Baeza-Yates, and R. Ramakrishnan. EDBT '08: Proceedings of the 11th international conference on Extending database technology, page 652--655. New York, NY, USA, ACM, (2008)