1. Object orientation: concepts, languages, databases, user interfaces;Abnous,1990
2. Graphical notation for object-oriented design and programming;Ackroyd;Journal of Object Oriented Programming,1991
3. Obstacles in object-oriented software development;Aksit;SIGPLAN Notices,1992
4. Transformation of data flow analysis models to object-oriented design;Alabiso;Sigplan Notices,1988
5. Polymorphic and reflective type structures;Alagic,1992