publication venue for
- Guest editorial: Special issue on WITS'96. 23:351-351. 1998
- Formalization of an IS-A based extended nested relation data model. 20:53-72. 1995
- Schema translation: A three-level semantic abstraction approach. 11:255-270. 1986
- A new model for data base abstraction. 7:1-12. 1982