- Vladimir Lifschitz, Ilkka Niemelä, editors, Logic Programming and Nonmonotonic Reasoning, 7th International Conference, LPNMR 2004, Fort Lauderdale, FL, USA, January 6-8, 2004, Proceedings. Volume 2923 of Lecture Notes in Computer Science, Springer, 2004.
- James P. Delgrande, Torsten Schaub, editors, 10th International Workshop on Non-Monotonic Reasoning (NMR 2004), Whistler, Canada, June 6-8, 2004, Proceedings. 2004.