GORODNII, M. F. On the approximation of a bounded solution of a linear differential equation in a Banach space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 9, p. 1268–1271, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4843. Acesso em: 6 dec. 2025.