Martin Große-Rhode. Towards Object-Oriented Algebraic Specifications. In Hartmut Ehrig, Klaus P. Jantke, Fernando Orejas, Horst Reichel, editors, Recent Trends in Data Type Specification, Proceedings 7th Workshop on Abstract Data Types, Wusterhausen, Dosse, Germany, April 17-20, 1990. Volume 534 of Lecture Notes in Computer Science, pages 98-116, Springer, 1990.