1. Report A-1978-4;R. J. R. Back,1978
2. R. J. R. Back. Procedural abstraction in the refinement calculus. Technical Report, Åbo Akademi University, Department of Computer Science. Turku, Finland 1987.
3. R. J. R. Back. Refinement calculus, part II: Parallel and reactive programs. In J. W. de Bakker, W.-P. de Roever, and G. Rozenberg, editors, Stepwise Refinement of Distributed Systems: Models, Formalisms, Correctness. Proceedings. 1989, volume 430 of Lecture Notes in Computer Science. Springer-Verlag, 1990.
4. R. J. R. Back and R. Kurki-Suonio. Decentralization of process nets with centralized control. In Proc. of the 2nd ACM SIGACT-SIGOPS Symp. on Principles of Distributed Computing, pages 131–142, 1983.
5. R. J. R. Back, A. J. Martin, and K. Sere. Specification of a Microprocessor. Technical Report, Åbo Akademi University, Department of Computer Science. Ser. A, No 148, Turku, Finland 1992.