Oliver Stegle Christoph Lippert Joris M. Mooij Neil D. Lawrence Karsten M. Borgwardt Efficient inference in matrix-variate Gaussian models with \iid observation noise. 630-638 2011 NIPS http://books.nips.cc/papers/files/nips24/NIPS2011_0443.pdf conf/nips/2011 db/conf/nips/nips2011.html#StegleLMLB11