@inproceedings{del-rio-2019-linguistic,
    title = "Linguistic features and proficiency classification in {L}2 {S}panish and {L}2{P}ortuguese.",
    author = "del R{\'i}o, Iria",
    editor = "Alfter, David  and
      Volodina, Elena  and
      Borin, Lars  and
      Pilan, Ildik{\'o}  and
      Lange, Herbert",
    booktitle = "Proceedings of the 8th Workshop on NLP for Computer Assisted Language Learning",
    month = sep,
    year = "2019",
    address = "Turku, Finland",
    publisher = "LiU Electronic Press",
    url = "https://preview.aclanthology.org/fix-sig-urls/W19-6304/",
    pages = "31--40"
}