1. Appleton B (1997) Patterns and Software: Essential Concepts and Terminology. Appeared in: Object Magazine Online, vol. 3, no. 5. Newest revision available at http://www.enteract.com/∼bradapp/docs/patterns-intro.html
2. Bekaert P, Steegmans E (2001) Non-Determinism in Conceptual Models. In: Proceedings of the tenth OOPSLA Workshop on Behavioral Semantics 2001, pp 24–34
3. Bekaert P, Delanote G, Devos F, Steegmans E (2002) Specialization/Generalization in Object-Oriented Analysis: Strengthening and Multiple Partitioning. Lecture Notes in Computer Science, vol 2426, pp 34–43
4. Booch G (1994) Object-Oriented Analysis and Design with Applications. The Benjamin/Cummings Publishing Company, Inc.
5. Borgida A, Mylopoulos J, Reiter R (1995) On the Frame problem in Procedure specifications. IEEE Transaction on Software Engineering 21:785–798, October