Pushmeet Kohli Alexander Shekhovtsov Carsten Rother Vladimir Kolmogorov Philip H. S. Torr On partial optimality in multi-label MRFs. 480-487 2008 ICML http://doi.acm.org/10.1145/1390156.1390217 conf/icml/2008 db/conf/icml/icml2008.html#KohliSRKT08