@InProceedings{riloff-patwardhan-wiebe:2006:EMNLP,
  author    = {Riloff, Ellen  and  Patwardhan, Siddharth  and  Wiebe, Janyce},
  title     = {Feature Subsumption for Opinion Analysis},
  booktitle = {Proceedings of the 2006 Conference on Empirical Methods in Natural Language Processing},
  month     = {July},
  year      = {2006},
  address   = {Sydney, Australia},
  publisher = {Association for Computational Linguistics},
  pages     = {440--448},
  url       = {http://www.aclweb.org/anthology/W/W06/W06-1652}
}