C. Lin, Y. Yu, J. Han, и B. Liu. Advances in Knowledge Discovery and Data Mining, стр. 222--229. Berlin, Heidelberg, Springer Berlin Heidelberg, (2010)
D. Cai, X. He, Z. Li, W. Ma, и J. Wen. Proceedings of the 12th annual ACM international conference on Multimedia - MULTIMEDIA \textquotesingle04, ACM Press, (2004)