C. Wang, and D. Blei. Proceedings of the 17th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 448--456. New York, NY, USA, ACM, (2011)
M. Pera, and Y. Ng. Proceedings of the 20th ACM International Conference on Information and Knowledge Management, page 2133--2136. New York, NY, USA, ACM, (2011)
C. Haruechaiyasak, and C. Damrongrat. Digital Libraries: Universal and Ubiquitous Access to Information, volume 5362 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2008)