ACM Transactions on Programming Languages and Systems 15, 1 (January 1993), 73-132. Also appeared as SRC Research Report 66. A preliminary version appeared in Stepwise Refinement of Distributed Systems, J. W. de Bakker, W.-P. de Roever, and G. Rozenberg editors, Springer-Verlag Lecture Notes in Computer Science Volume 430 (1989), 1-41. |
July 1993