Program development by stepwise refinement
Communications of the ACM
An axiomatic basis for computer programming
Communications of the ACM
An algebraic definition of simulation between programs
An algebraic definition of simulation between programs
SIMULA 67 common base language, (Norwegian Computing Center. Publication)
SIMULA 67 common base language, (Norwegian Computing Center. Publication)
An observationally complete program logic for imperative higher-order functions
Theoretical Computer Science
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A powerful method of simplifying the proofs of program correctness is suggested; and some new light is shed on the problem of functions with side-effects.