1. Maintenance of stratified databases viewed as a belief revision system;Apt,1987
2. A framework for supporting triggers in deductive databases;Bayer,1993
3. An amateur's introduction to recursive query processing strategies;Bancilhon,1986
4. Integrating object-oriented data modeling with a rule-based programming paradigm;Cacace,1990
5. A declarative approach to active databases;Ceri,1992