T. Moon, A. Smola, Y. Chang, и Z. Zheng. Proceedings of the third ACM international conference on Web search and data mining, стр. 151--160. New York, NY, USA, ACM, (2010)
M. Deodhar, и J. Ghosh. Proceedings of the 15th ACM SIGKDD international conference on Knowledge discovery and data mining, стр. 249--258. New York, NY, USA, ACM, (2009)