@inproceedings{hassan-mihalcea-2009-learning,
    title = "Learning to Identify Educational Materials",
    author = "Hassan, Samer  and
      Mihalcea, Rada",
    editor = "Angelova, Galia  and
      Mitkov, Ruslan",
    booktitle = "Proceedings of the International Conference {RANLP}-2009",
    month = sep,
    year = "2009",
    address = "Borovets, Bulgaria",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/R09-1024/",
    pages = "123--127"
}