@inproceedings{submodularoptimizationwithsubmodularcove,
  title = {Submodular Optimization with Submodular Cover and Submodular Knapsack Constraints},
  author = {Rishabh K. Iyer and Jeff A. Bilmes},
  year = {2013},
  booktitle = {NeurIPS 2013 12},
  url = {http://papers.nips.cc/paper/4911-submodular-optimization-with-submodular-cover-and-submodular-knapsack-constraints},
}