@inproceedings{mccallum-li-2003-early,
    title = "Early results for Named Entity Recognition with Conditional Random Fields, Feature Induction and Web-Enhanced Lexicons",
    author = "McCallum, Andrew  and
      Li, Wei",
    booktitle = "Proceedings of the Seventh Conference on Natural Language Learning at {HLT}-{NAACL} 2003",
    year = "2003",
    url = "https://preview.aclanthology.org/fix-sig-urls/W03-0430/",
    pages = "188--191"
}