IL'CHENKO, Yu. V.; CHAIKOVS'KYI, A. V. Cauchy problem for a differential equation in the Banach space with generalized strongly positive operator coefficient. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 8, p. 1053–1070, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2784. Acesso em: 5 dec. 2025.