Inderjit S. Dhillon Suvrit Sra Generalized Nonnegative Matrix Approximations with Bregman Divergences. 2005 conf/nips/2005 NIPS http://books.nips.cc/papers/files/nips18/NIPS2005_0203.pdf db/conf/nips/nips2005.html#DhillonS05