CHERNOBAI, O. B. On generalized solutions of differential equations with operator coefficients. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 5, p. 715–720, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3489. Acesso em: 5 dec. 2025.