Andrej Bogdanov Elchanan Mossel Salil P. Vadhan The Complexity of Distinguishing Markov Random Fields. 331-342 2008 APPROX-RANDOM http://dx.doi.org/10.1007/978-3-540-85363-3_27 conf/approx/2008 db/conf/approx/approx2008.html#BogdanovMV08