Dimensions of Active Behaviour. - Norman W. Paton; Oscar Díaz 001; M. Howard Williams; Jack Campin; Andrew Dinn; Arturo Jaime 001 (Rules in Database Systems, 1993)

Formal Specification of Active Database Functionality: A Survey. - Norman W. Paton; Jack Campin; Alvaro A. A. Fernandes; M. Howard Williams (Rules in Database Systems, 1995)

A structured specification of an active database system. - Jack Campin; Norman W. Paton; M. Howard Williams (Inf. Softw. Technol., 1995)

Specifying Active Database Systems in an Object-Oriented Framework. - Jack Campin; Norman W. Paton; M. Howard Williams (Int. J. Softw. Eng. Knowl. Eng., 1997)