1. G. Agha. Actors: A Model of Concurrent Computation in Distributed Systems. MIT Press, Los Alamos, California, 1986.
2. R. J. R. Back. On the Correctness of Refinement Steps in Program Development. PhD thesis, Department of Computer Science, University of Helsinki, Helsinki, Finland, 1978. Report A-1978-4.
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 and K. Sere. Stepwise refinement of action systems. Structured Programming, 12:17–30, 1991.