1. Data functions, Datalog and negation;Abiteboul,1988
2. Introduction to logic programming, Technical Report;Apt,1987
3. A transaction language complete for database update and specification;Abiteboul,1987
4. Procedural and declarative database update language;Abiteboui,1988
5. Fixpoint extensions of first-order logic and Datalog-like languages;Abiteboul,1989