1. On the correctness of refinement in program development;Back,1978
2. Correctness preserving program refinements: Proof theory and applications;Back,1980
3. Procedural abstraction in the refinement calculus;Back;Åbo Akademi, Reports on Computer Science and Mathematics Ser. A,1987
4. A calculus of refinements for program derivations;Back;Acta Inform.,1988
5. Refining atomicity in parallel algorithms;Back,1989