1. M. Abadi and L. Lamport. The existence of refinement mappings. In Proc. $ni IEEE Symp. on LICS, Edinburgh, 1988.
2. R. J. R. Back. Correctness Preserving Program Refinements: Proof Theory and Applications, volume 131 of Mathematical Center Thacts. Mathematical Centre, Amsterdam, 1980.
3. R. J. R. Back. Changing data representation in the refinement calculus. In 21st Hawaii International Conference on System Sciences. IEEE, January 1989.
4. R. J. R. Back. Refining atomicity in parallel algorithms. In PARLE 89 Parallel Architectures and Languages Europe, volume 366 of Lecture Notes in Computer Science, Eindhoven, the Netherlands, June 1989. Springer Verlag, 1989.
5. R. J. R. Back. Refinement calculus II: Parallel and reactive programs. In J. W. deBakker, W. P. deRoever, and G. Rozenberg, editors, Stepwise Refinement of Distributed Systems, volume 430 of Lecture Notes in Computer Science, pages 6793. Springer Verlag, 1990.