@article{8:6,author={Tapani Raiko and Harri Valpola and Markus Harva and Juha Karhunen}, Title={Building Blocks for Variational Bayesian Learning of Latent Variable Models},journal={Journal of Machine Learning Research},volume={8}, url={http://www.jmlr.org/papers/volume8/raiko07a/raiko07a.pdf}}