LOPUSHANSKY, O.V.; SHARYN, S.V. Functional calculus for generators of analytic semigroups of operators. Carpathian Mathematical Publications, [S. l.], v. 4, n. 1, p. 83–89, 2012. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/2469. Acesso em: 23 apr. 2024.