@inproceedings{optimizationforapproximatesubmodularity,
  title = {Optimization for Approximate Submodularity},
  author = {Yaron Singer and Avinatan Hassidim},
  year = {2018},
  booktitle = {NeurIPS 2018 12},
  url = {http://papers.nips.cc/paper/7322-optimization-for-approximate-submodularity},
}