@inproceedings{core-conferenza,
  title = "Infeasibility Certificates and the Complexity of the Core in Coalitional Games",
  author = "Enrico Malizia and Luigi Palopoli and Francesco Scarcello",
  year = "2007",
  address = "Hyderabad, India",
  booktitle = "Proceedings of the 20th International Joint Conference on Artificial Intelligence (IJCAI-07)",
  editor = "Manuela M. Veloso",
  month = "January 6--12",
  pages = "1402--1407",
  url = "http://www.ijcai.org/papers07/Papers/IJCAI07-226.pdf",
}