1. Decentralisation of process nets with centralised control;Back,1983
2. Failures without chaos: A new process semantics for fair abstraction;Bergstra,1987
3. Refinement in Z and Object-Z;Derrick,2001
4. A Discipline of Programming;Dijkstra,1976
5. Predicate Calculus and Program Semantics;Dijkstra,1990