A. Borisov, M. Wardenaar, I. Markov, and M. de Rijke. The 41st International ACM SIGIR Conference on Research &\#38; Development in Information Retrieval, page 45--54. New York, NY, USA, ACM, (2018)
M. Hildebrand, J. van Ossenbruggen, and L. Hardman. International Semantic Web Conference, volume 4273 of Lecture Notes in Computer Science, page 272-285. Springer, (2006)
R. Jones, R. Kumar, B. Pang, and A. Tomkins. CIKM '07: Proceedings of the sixteenth ACM conference on Conference on information and knowledge management, page 909--914. New York, NY, USA, ACM, (2007)