New Outer Bounds on the Marginal Polytope.

David Sontag Tommi Jaakkola New Outer Bounds on the Marginal Polytope. 2007 NIPS http://books.nips.cc/papers/files/nips20/NIPS2007_0813.pdf conf/nips/2007 db/conf/nips/nips2007.html#SontagJ07