@InProceedings{zhu-EtAl:2014:P14-1,
  author    = {Zhu, Xiaodan  and  Guo, Hongyu  and  Mohammad, Saif  and  Kiritchenko, Svetlana},
  title     = {An Empirical Study on the Effect of Negation Words on Sentiment},
  booktitle = {Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)},
  month     = {June},
  year      = {2014},
  address   = {Baltimore, Maryland},
  publisher = {Association for Computational Linguistics},
  pages     = {304--313},
  url       = {http://www.aclweb.org/anthology/P/P14/P14-1029}
}