@InProceedings{fei-liu:2016:N16-1,
  author    = {Fei, Geli  and  Liu, Bing},
  title     = {Breaking the Closed World Assumption in Text Classification},
  booktitle = {Proceedings of the 2016 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies},
  month     = {June},
  year      = {2016},
  address   = {San Diego, California},
  publisher = {Association for Computational Linguistics},
  pages     = {506--514},
  url       = {http://www.aclweb.org/anthology/N16-1061}
}