GORBACHUK, V. M. Behaviour on the infinity of the solution of the differential-operator first order equation in the Banach space. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 5, p. 629–631, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8812. Acesso em: 6 dec. 2025.