James H. Griesmer, Richard D. Jenks, David Y. Y. Yun. A SCRATCHPAD solution to problem #7. ACM Comm. Computer Algebra, 9(3):13-17, 1975. [doi]
@article{GriesmerJY75, title = {A SCRATCHPAD solution to problem #7}, author = {James H. Griesmer and Richard D. Jenks and David Y. Y. Yun}, year = {1975}, doi = {10.1145/1088309.1088314}, url = {http://doi.acm.org/10.1145/1088309.1088314}, researchr = {https://researchr.org/publication/GriesmerJY75}, cites = {0}, citedby = {0}, journal = {ACM Comm. Computer Algebra}, volume = {9}, number = {3}, pages = {13-17}, }