1. Completeness of Query Languages for the Entity-Relationship Model;Atzeni,1983
2. A Formal Approach to Null Values in Relational Databases;Biskup,1981
3. A Relational Theory of Model Management;Blanning,1985
4. The Existence and Uniqueness of Joins in Relational Model Banks;Blanning;International Journal on Policy and Information,1985
5. A Relational Framework for Join Implementation in Model Management Systems;Blanning;Decision Support Systems,1985