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* Edsger W. Dijkstra. "Guarded commands, nondeterminacy and formal derivation of programs". ''Communications of the [[Association for Computing Machinery|ACM]]'', 18(8):453-457, August 1975. [http://doi.acm.org/10.1145/360933.360975]
* Leslie Lamport. "''win'' and ''sin'': Predicate Transformers for Concurrency". ''[[Association for Computing Machinery|ACM]] Transactions on Programming Languages and Systems'', 12(3), (July 1990). [http://research.microsoft.com/users/lamport/pubs/pubs.html#lamport-win]
* Ralph-Johan J. Back et al. "Refinement Calculus: A Systematic Introduction, 1st edition". 1998. ISBN 0-387-98417-8
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