@inproceedings{suzuki-etal-2009-empirical,
    title = "An Empirical Study of Semi-supervised Structured Conditional Models for Dependency Parsing",
    author = "Suzuki, Jun  and
      Isozaki, Hideki  and
      Carreras, Xavier  and
      Collins, Michael",
    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://aclanthology.org/D09-1058/",
    pages = "551--560"
}