Edsger W. Dijkstra. Guarded Commands, Nondeterminacy and Formal Derivation of Programs. Communications of the ACM, 18(8):453-457, 1975.
@article{Dijkstra75:1, title = {Guarded Commands, Nondeterminacy and Formal Derivation of Programs}, author = {Edsger W. Dijkstra}, year = {1975}, researchr = {https://researchr.org/publication/Dijkstra75%3A1}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {18}, number = {8}, pages = {453-457}, }