Alexander Borgida, Sol J. Greenspan. Data and Activities: Exploiting Hierarchies of Classes. In Michael L. Brodie, Stephen N. Zilles, editors, Proceedings of the Workshop on Data Abstraction, Databases and Conceptual Modelling, Pingree Park, Colorado, June 23-26, 1980. Volume 11 of pages 98-100, ACM Press, 1980. [doi]
Abstract is missing.