1. E. Blake and S. Cook. On Including Part Hierarchies in Object-Oriented Languages with an Implementation in Smalltalk. In ECOOP'87 Proceedings, 1987.
2. D. Coleman, P. Arnold, S. Bodoff, S. Dollin, H. Gilchrist, F. Hayes and P. Jeremes. Object-Oriented Development — The Fusion Method, Prentice Hall, 1994.
3. U. Dayal, E. Hanson and J. Widow. Active Database Systems. In W. Kim, editor, Modern Database Systems, Addison-Wesley Publishing Company, 1995.
4. S. Ducasse, M. Blay and A.M. Pinna. A Reflective Model for First Class Dependencies. In ACM OOPSLA'95 Proceedings, 1995.
5. A. Goldberg and D. Robson. Smalltalk-80: The Language and its Implementation, Addison-Wesley, 1983.