@article{necessaryandsufficientconditionsanda,
  title = {Necessary and Sufficient Conditions and a Provably Efficient Algorithm for Separable Topic Discovery},
  author = {Weicong Ding and Prakash Ishwar and Venkatesh Saligrama},
  year = {2015},
  eprint = {1508.05565},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1508.05565v2},
}