1. Algebraic specifications of computable and semicomputable data structures;Bergstra,1979
2. On specifying sets of integers;Bergstra,1980
3. An initial algebra approach to the specification, correctness and implementation of abstract data types;Goguen,1978
4. H.A. Klaeren, A simple class of algorithmic specifications for abstract software modules, Proceedings of MFCS'80, to appear.
5. Specification of abstract data types using conditional axioms;Thatcher;IBM T.J. Watson Research Centre Report RC-6214,1976