J.  Lellmann, Lenzen, F., and Schnörr, C., ?Optimality Bounds for a Variational Relaxation of the Image PartitioningProblem?, in Energy Min. Meth. Comp. Vis. Patt. Recogn., 2011, pp. 132-146.

J.  Lellmann, Lenzen, F., and Schnörr, C., ?Optimality Bounds for Variational Relaxations of Optimal PartitionProblems?, 2010.