8.6 References

[1] UML 1.4 and OCL URL: www.omg.org/cgi-bin/doc?formal/01-09-67

[2] Shlaer, Sally, and Stephen J. Mellor: Object-Oriented Systems Analysis: Modeling the World in Data. Prentice-Hall, Englewood Cliffs, N.J., 1988.

[3] Shlaer, Sally, and Stephen J. Mellor: Object Lifecycles: Modeling the World in States. Prentice Hall PTR, Englewood Cliffs, N.J., 1992