@InProceedings{moreira-EtAl:2013:SemEval-2013,
  author    = {Moreira, Silvio  and  Filgueiras, Jo\~{a}o  and  Martins, Bruno  and  Couto, Francisco  and  Silva, M\'{a}rio J.},
  title     = {REACTION: A naive machine learning approach for sentiment classification},
  booktitle = {Second Joint Conference on Lexical and Computational Semantics (*SEM), Volume 2: Proceedings of the Seventh International Workshop on Semantic Evaluation (SemEval 2013)},
  month     = {June},
  year      = {2013},
  address   = {Atlanta, Georgia, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {490--494},
  url       = {http://www.aclweb.org/anthology/S13-2081}
}