1. Two formalisms of extended possibilistic logic programming with context-dependent fuzzy unification: A comparative description;Alsinet;Electronic Notes in Theoretical Computer Science,2002
2. Knowledge Representation, Reasoning and Declarative Problem Solving;Baral,2003
3. G. Brewka, Complex preferences for answer set optimization, in: Proceedings of the Ninth International Conference on the Principles of Knowledge Representation and Reasoning (KR2004), 2004, pp. 213–223.
4. G. Brewka, I. Niemelä, M. Truszczyński, Answer set optimization, in: Proceedings of the 18th International Joint Conference on Artificial Intelligence, 2003, pp. 867–872.
5. Enhancing disjunctive datalog by constraints;Buccafurri;IEEE Transactions on Knowledge and Data Engineering,2000