BULDYGIN, V. V.; KLESOV, O. I.; STEINEBACH, J. G. On the convergence of positive increasing functions to infinity. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 10, p. 1299–1308, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2956. Acesso em: 5 dec. 2025.