R. Nallapati, A. Ahmed, E. Xing, and W. Cohen. Proceedings of the 14th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 542--550. New York, NY, USA, ACM, (2008)
H. Wallach, I. Murray, R. Salakhutdinov, and D. Mimno. Proceedings of the 26th Annual International Conference on Machine Learning, page 1105--1112. New York, NY, USA, ACM, (2009)
M. Rosen-Zvi, T. Griffiths, M. Steyvers, and P. Smyth. Proceedings of the Twentieth Conference on Uncertainty in Artificial Intelligence (UAI), San Francisco, CA, Morgan Kaufmann, (2004)