Hartmut Ehrig, Hans-Jörg Kreowski, Peter Padawitz. A Case Study of Abstract Implementations and Their Correctness. In Bernard Robinet, editor, International Symposium on Programming, Proceedings of the Fourth Colloque International sur la Programmation , Paris, France, 22-24 April 1980. Volume 83 of Lecture Notes in Computer Science, pages 108-122, Springer, 1980.
Abstract is missing.