1. Constraint description in ADAM;Bassiliades,1992
2. Modelling constraints with exceptions in object-oriented databases;Bassiliades,1992
3. I lied about the trees or, defaults and definitions in knowledge representation;Brachman;AI Mag.,1985
4. Checking consistency of database constraints: A logical basis;Bry,1986
5. Deriving production rules for constraint maintenance;Ceri,1990