References
Frank & Ulrich: ”Delegation: An Important Concept for the Appropriate Design of Object Models”, JOOP June 2000 (pp13-17, 44)
Eliens: Principles of OO Software Dev. 2ed., AWL 2000 (Sect. 5.4: Prototypes - delegation vs. inheritance)
Kilov/Ross: Information Models, PH 1994 (Not about delegation, but covers multiple/concurrent/overlapping subclass membership.)
Lee &Tepfenhart: UML and C++: A Practical Guide to OO Dev, 2ed, PH 2001(pp206-210) (Multiple Inheritance examples Fig. 12-4,12-5)
Sanders: Data Modeling, Boyd-Fraser/ITP 1995 (Ch. 3 and Appendix)