IFIP TC8/WG8.1 Working Conference on the Obiect Oriented Approach in Information Systems.IFIP TC8/WG 8.1 Working Conference on the Object Oriented Approach in Information Systems(1991 : Quebec City)：Object oriented approach in information systems.NH,1991.
IFIP TC8/WG 8.1 Working Conference on the Object Oriented Approach in Information Systems(1991 : Quebec City)：Object oriented approach in information systems
IFIP TC8/WG8.1 Working Conference on the Obiect Oriented Approach in Information Systems.NH,1991.
