1. Recursive aggregates in disjunctive logic programs: Semantics and complexity;Faber,2004
2. F. Calimeri, W. Faber, N. Leone, S. Perri, Declarative and computational properties of logic programs with aggregates, in: Nineteenth International Joint Conference on Artificial Intelligence (IJCAI-05), 2005, pp. 406–411.
3. J. McCarthy, Programs with common sense, in: Proceedings of the Teddington Conference on the Mechanization of Thought Processes, Her Majesty's Stationery Office, 1959, pp. 75–91.
4. Some philosophical problems from the standpoint of artificial intelligence;McCarthy,1969
5. A framework for representing knowledge;Minsky,1975