1. Similarity preservation in default logic;Ben-Eliyahu-Zohary;Ann. Math. Artif. Intell.,1999
2. Model Theory;Chang,1990
3. R. Guerreiro, M. Casanova, An alternative semantics for default logic, Presented at the Third Internat. Workshop on Nonmonotonic Reasoning, 1990.
4. A comparative study of open default theories;Kaminski;Artif. Intell.,1995
5. A note on the stable model semantics for logic programs;Kaminski;Artif. Intell.,1997