@inproceedings{sun-etal-2011-semi,
    title = "Semi-supervised Relation Extraction with Large-scale Word Clustering",
    author = "Sun, Ang  and
      Grishman, Ralph  and
      Sekine, Satoshi",
    editor = "Lin, Dekang  and
      Matsumoto, Yuji  and
      Mihalcea, Rada",
    booktitle = "Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies",
    month = jun,
    year = "2011",
    address = "Portland, Oregon, USA",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-emnlp/P11-1053/",
    pages = "521--529"
}