@InProceedings{ritter-EtAl:2011:EMNLP,
  author    = {Ritter, Alan  and  Clark, Sam  and  Mausam  and  Etzioni, Oren},
  title     = {Named Entity Recognition in Tweets: An Experimental Study},
  booktitle = {Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing},
  month     = {July},
  year      = {2011},
  address   = {Edinburgh, Scotland, UK.},
  publisher = {Association for Computational Linguistics},
  pages     = {1524--1534},
  url       = {http://www.aclweb.org/anthology/D11-1141}
}