1. Semantics and termination of nondeterministic recursive programs;De Bakker,1976
2. The programming language Concurrent Pascal;Brinch-Hansen;IEEE Trans. Software Engrg.,1975
3. Program proving: Coroutines;Clint;Acta Informatica,1973
4. A Discipline Programming;Dijkstra,1976
5. An elephant inspired by the Dutch National Flag;Dijkstra;EWD 608,1977