JaeMo Sung Zoubin Ghahramani Sung Yang Bang Latent-Space Variational Bayes. 2236-2242 2008 30 IEEE Trans. Pattern Anal. Mach. Intell. 12 http://dx.doi.org/10.1109/TPAMI.2008.157 db/journals/pami/pami30.html#SungGB08