@article{algorithmsforapproximateminimizationof,
  title = {Algorithms for Approximate Minimization of the Difference Between Submodular Functions, with Applications},
  author = {Rishabh Iyer and Jeff Bilmes},
  year = {2012},
  eprint = {1207.0560},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1207.0560v4},
}