SAVKA, I.Ya. Nonlocal problem with dependent coefficients in conditions for the second-order equation in time variable. Carpathian Mathematical Publications, [S. l.], v. 2, n. 2, p. 101–110, 2010. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/3970. Acesso em: 23 jun. 2024.