@article{approximatesubmodularfunctionsand,
  title = {Approximate Submodular Functions and Performance Guarantees},
  author = {Gaurav Gupta and Sergio Pequito and Paul Bogdan},
  year = {2018},
  eprint = {1806.06323},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1806.06323v1},
}