@inproceedings{ijcai2005p268,
  title     = {Learning Complex Event Descriptions by Abstraction},
  author    = {Galassi, Ugo and Giordana, Attilio and Saitta, Lorenza and Botta, Marco},
  booktitle = {Proceedings of the Nineteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-05}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  pages     = {1600--1600},
  year      = {2005},
  url       = {https://ijcai.org/proceedings/2005/268},
}