@inproceedings{SonJaa_nips08,
 title  = {New Outer Bounds on the Marginal Polytope},
 author = {David Sontag and Tommi Jaakkola}, 
 booktitle = {Advances in Neural Information Processing Systems 20},
 editor = {J.C. Platt and D. Koller and Y. Singer and S. Roweis},
 publisher = {MIT Press},
 address = {Cambridge, MA},
 pages = {1393--1400},
 year = {2008}
}