KLYMCHUK, S. O.; MAKARCHUK, O. P.; PRATSIOVYTYI, M. V. Frequency of a Digit in the Representation of a Number and the Asymptotic Mean Value of the Digits. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 3, p. 302–310, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2133. Acesso em: 5 dec. 2025.