@inproceedings{lu-etal-2008-simple,
    title = "Simple but effective feedback generation to tutor abstract problem solving",
    author = "Lu, Xin  and
      Di Eugenio, Barbara  and
      Ohlsson, Stellan  and
      Fossati, Davide",
    editor = "White, Michael  and
      Nakatsu, Crystal  and
      McDonald, David",
    booktitle = "Proceedings of the Fifth International Natural Language Generation Conference",
    month = jun,
    year = "2008",
    address = "Salt Fork, Ohio, USA",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/W08-1114/",
    pages = "104--112"
}