BanakhT. O., ProtasovI. V., and ProtasovaK. D. “Descriptive Complexity of the Sizes of Subsets of groups”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 9 (September 25, 2017): 1280-1283. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1780.