Peter Pepper A Simple Calculus for Program Transformation (Inclusive of Induction). [Citation Graph (0, 0)][DBLP] Sci. Comput. Program., 1987, v:9, n:3, pp:221-262 [Journal]
Joseph M. Morris A Theoretical Basis for Stepwise Refinement and the Programming Calculus. [Citation Graph (0, 0)][DBLP] Sci. Comput. Program., 1987, v:9, n:3, pp:287-306 [Journal]
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