Issue No. 05 - September/October (1987 vol. 4)
D.C. Halbert , Digital Equipment Corp.
To be a good object-oriented programmer, you should use types and inheritance wisely. ThiS tutorial will help you do so.
D. Halbert and P. O'Brien, "Using Types and Inheritance in Object-Oriented Programming," in IEEE Software, vol. 4, no. , pp. 71-79, 1987.