Boundary-value problems with initial jumps for singularly perturbed integro-differential equation. Neliniini Kolyvannya, [S. l.], v. 19, n. 1, p. 11–21, 2016. Disponível em: https://nosc.imath.kiev.ua/index.php/nosc/article/view/807. Acesso em: 12 apr. 2026.