John P. Fitch. A simple method of taking nth roots of integers. ACM Comm. Computer Algebra, 8(4):26, 1974. [doi]
@article{Fitch74b, title = {A simple method of taking nth roots of integers}, author = {John P. Fitch}, year = {1974}, doi = {10.1145/1088288.1088292}, url = {http://doi.acm.org/10.1145/1088288.1088292}, researchr = {https://researchr.org/publication/Fitch74b}, cites = {0}, citedby = {0}, journal = {ACM Comm. Computer Algebra}, volume = {8}, number = {4}, pages = {26}, }