1. On the Power of Languages for the Manipulation of Complex Objects;Abiteboul,1988
2. Data semantics;Abrial,1974
3. Towards a theory of declarative knowledge;Apt,1988
4. COL: A logic-based language for complex objects;Abiteboul,1988
5. Reduction of the relational model with infinite domain to the case of finite domains;Aylamazyan,1986