@article {citation212, title = {Log-determinant relaxation for approximate inference in discrete Markov random field}, journal = {Signal Processing, IEEE Transactions on}, volume = {54}, number = {6}, year = {2006}, month = {06/2006}, pages = {2099-2109}, issn = {1053-587X}, doi = {10.1109/TSP.2006.874409}, url = {http://www.cs.berkeley.edu/~jordan/papers/WaiJor_IEEE_TSP_05.pdf}, author = {M. J. Wainwright and M. I. Jordan} }