ZABOLOTSKII, N. V.; SHEREMETA, M. M. A generalization of the Lindelöf theorem. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 9, p. 1177–1192, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4834. Acesso em: 5 dec. 2025.