D. Cai, X. He, Z. Li, W. Ma, and J. Wen. Proceedings of the 12th annual ACM international conference on Multimedia - MULTIMEDIA \textquotesingle04, ACM Press, (2004)
L. Wu, X. Hua, N. Yu, W. Ma, and S. Li. MM '08: Proceeding of the 16th ACM international conference on Multimedia, page 31--40. New York, NY, USA, ACM, (2008)
X. Li, L. Chen, L. Zhang, F. Lin, and W. Ma. MULTIMEDIA '06: Proceedings of the 14th annual ACM international conference on Multimedia, page 607--610. New York, NY, USA, ACM, (2006)