@inproceedings{namedentityrecognitionintweetsan,
  title = {Named Entity Recognition in Tweets: An Experimental Study},
  author = {Alan Ritter and Sam Clark and Mausam Etzioni and Oren Etzioni},
  year = {2011},
  booktitle = {Conference on Empirical Methods in Natural Language Processing 2011 7},
  url = {https://aclanthology.org/D11-1141.pdf},
}