KOTOVA, O. V. Continuum cardinality of the set of solutions of one class of equations that contain the function of frequency of ternary digits of a number. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 10, p. 1414–1421, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3255. Acesso em: 14 apr. 2025.