1. A calculus for recursive program schemes;de Bakker,1973
2. Recursive Program Schemes: Semantics and Proof Theory;de Roever,1974
3. Characterizing correctness properties of parallel programs using fixpoints;Emerson,1980
4. Propositional dynamic logic of regular programs;Fischer;J. Comput. System Sci.,1979
5. First-Order Dynamic Logic;Harel,1979