@inproceedings{ijcai2003p78,
  title     = {Spaces of Theories with Ideal Refinement Operators},
  author    = {Fanizzi, Nicola and Ferilli, Stefano and Di Mauro, Nicola and Basile, Teresa Maria Altomare},
  booktitle = {Proceedings of the Eighteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-03}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Georg Gottlob},
  pages     = {527--531},
  year      = {2003},
  url       = {https://ijcai.org/proceedings/2003/78},
}