@inproceedings{thede-harper-1999-second,
    title = "A Second-Order Hidden {M}arkov Model for Part-of-Speech Tagging",
    author = "Thede, Scott M.  and
      Harper, Mary P.",
    booktitle = "Proceedings of the 37th Annual Meeting of the Association for Computational Linguistics",
    month = jun,
    year = "1999",
    address = "College Park, Maryland, USA",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-emnlp/P99-1023/",
    doi = "10.3115/1034678.1034712",
    pages = "175--182"
}