@inproceedings{lin-etal-2009-recognizing,
    title = "Recognizing Implicit Discourse Relations in the {P}enn {D}iscourse {T}reebank",
    author = "Lin, Ziheng  and
      Kan, Min-Yen  and
      Ng, Hwee Tou",
    editor = "Koehn, Philipp  and
      Mihalcea, Rada",
    booktitle = "Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing",
    month = aug,
    year = "2009",
    address = "Singapore",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/D09-1036/",
    pages = "343--351"
}