X. Zhou, J. Gaugaz, W. Balke, and W. Nejdl. SIGMOD '07: Proceedings of the 2007 ACM SIGMOD international conference on Management of data, page 545--556. New York, NY, USA, ACM Press, (2007)
X. Zhu, W. Nejdl, and M. Georgescu. The 37th International ACM SIGIR conference on research and development in Information Retrieval (SIGIR’14), (July 2014)
X. Zhu, W. Nejdl, and M. Georgescu. The 37th International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR '14, Gold Coast , QLD, Australia - July 06 - 11, 2014, page 223--232. ACM, (2014)
X. Zhu, W. Nejdl, and M. Georgescu. The 37th International ACM SIGIR conference on research and development in Information Retrieval (SIGIR’14), (July 2014)