@InProceedings{li-liu-ng:2010:EMNLP,
  author    = {Li, Xiao-Li  and  Liu, Bing  and  Ng, See-Kiong},
  title     = {Negative Training Data Can be Harmful to Text Classification},
  booktitle = {Proceedings of the 2010 Conference on Empirical Methods in Natural Language Processing},
  month     = {October},
  year      = {2010},
  address   = {Cambridge, MA},
  publisher = {Association for Computational Linguistics},
  pages     = {218--228},
  url       = {http://www.aclweb.org/anthology/D10-1022}
}