1. The object-oriented database system manifesto;Atkinson,1989
2. Queries in object-oriented databases;Banerjee,1988
3. A foundation for evolution from relational to object databases;Beech,1988
4. Indexing techniques for queries on nested objects;Bertino;IEEE Trans. Knowledge Data Engrg.,1989
5. Optimization of queries using nested indices;Bertino,1990