On the Cauchy problem for two-­dimensional systems of linear functional differential equations with monotone operator. Neliniini Kolyvannya, [S. l.], v. 10, n. 4, p. 560–573, 2007. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/456. Acesso em: 8 dec. 2025.