1. D. Jason Penney and Jacob Stein. Class Modification in the GemStone Object-Oriented DBMS. In Proceedings of the Conference on Object-Oriented Systems, Languages and Applications (OOPSLA), Orlando, Florida, USA, pages 111–117, October 1987.
2. Jay Banerjee, Won Kim, Hyoung-Joo Kim, and Henry F. Korth. Semantics and Implementation of Schema Evolution in Object-Oriented Databases. In Proceedings of ACMISIGMOD (Management of Data), Chicago, Illinois, USA, 1987, pages 311–322, May 1987.
3. M. Ahlsén, A. Björnerstedt, S. Britts, C. Hultén, and L. Söderlund. Making Type Changes Transparent. In Proceedings of IEEE Workshop on Languages for Automation, Chicago, pages 110–117. IEEE Computer Society Press, November 1983.
4. Andrea H. Skarra and Stanley B. Zdonik. Type Evolution in an Object-Oriented Database. In Bruce Shriver and Peter Wegner (Eds.): Research Directions in Object-Oriented Programming, pages 393–415. MIT Press, 1987.
5. S.R. Monk and I. Sommerville. A Model for Versioning of Classes in Object-Oriented Databases. In 10th British National Conference onDatabases (BNCOD’ 92), Aberdeen, Scotland July 1992, pages 42–58, July 1992.