Manfred Broy, Martin Wirsing. On the Algebraic Extensions of Abstract Data Types. In Josep Díaz, Isidro Ramos, editors, Formalization of Programming Concepts, International Colloquium, Peniscola, Spain, April 19-25, 1981, Proceedings. Volume 107 of Lecture Notes in Computer Science, pages 244-251, Springer, 1981.
Abstract is missing.