1. Towards a deductive object-oriented database language;Abiteboul,1989
2. COL — A logical approach to the manipulation of complex objects;Abiteboul,1988
3. Object identity as a query language primitive;Abiteboul,1989
4. On the power of languages for the manipulation of complex objects;Abiteboul,1988
5. IFO: A formal semantic database model;Abiteboul;ACM Trans. Database Systems,1987