Jay M. Spitzen, Karl N. Levitt, Lawrence Robinson. An Example of Hierarchical Design and Proof. Communications of the ACM, 21(12):1064-1075, 1978.
@article{SpitzenLR78, title = {An Example of Hierarchical Design and Proof}, author = {Jay M. Spitzen and Karl N. Levitt and Lawrence Robinson}, year = {1978}, tags = {design}, researchr = {https://researchr.org/publication/SpitzenLR78}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {21}, number = {12}, pages = {1064-1075}, }