VOSKRESENSKII, E. V. On the upper bound of uniformly bounded solutions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 5, p. 501–505, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5713. Acesso em: 14 apr. 2025.