@inproceedings{okanohara-tsujii-2009-learning,
    title = "Learning Combination Features with {L}1 Regularization",
    author = "Okanohara, Daisuke  and
      Tsujii, Jun{'}ichi",
    editor = "Ostendorf, Mari  and
      Collins, Michael  and
      Narayanan, Shri  and
      Oard, Douglas W.  and
      Vanderwende, Lucy",
    booktitle = "Proceedings of Human Language Technologies: The 2009 Annual Conference of the North {A}merican Chapter of the Association for Computational Linguistics, Companion Volume: Short Papers",
    month = jun,
    year = "2009",
    address = "Boulder, Colorado",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/N09-2025/",
    pages = "97--100"
}