STEPANETS, A. I.; PACHULIA, N. L. On behaviour of deviations’ group on sets of $(\psi,\beta)$-differentiable functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 1, p. 101–105, 1987. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9063. Acesso em: 5 dec. 2025.