1. S. Abiteboul and A. Bonner. Objects and Views. In Proceedings of the ACM/SIGMOD International Conference on the Management of Data, 1991.
2. S. Abiteboul and C. Souza dos Santos. IQL(2): A model with ubiquitous objects. In Database Programming Languages (DBPL-5), Proceedings of the Fifth International Workshop on Database Programming Languages Gubbio, Umbria, Italy, 6-8 September, 1995, 1995.
3. A. Albano, R. Bergamini, G. Ghelli, and R. Orsini. An object data model with roles. In Rakesh Agrawal, Sean Baker, and David Bell, editors, VLDB’ 93: proceedings of the 19th International Conference on Very Large Data Bases, August 2427, 1993, Dublin, Ireland, pages 39–51, Palo Alto, Calif., USA, 1993. Morgan Kaufmann Publishers.
4. J. Andany, M. Leonard, and C. Palisser. Management of schema evolution in databases. In Proceedings of International Conference on Very Large Data Bases (VLDB’91), Barcelona, Spain, 1991.
5. J. Banerjee, W. Kim, K.J. Kim, and H. Korth. Semantics and Implementation of Schema Evolution Object-Oriented Databases. In Proceedings of the ACM SIGMOD Conference, San Francisco, California, pages 311–322, 1987.