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://twinhead.imath.kiev.ua/index.php/nosc/article/view/807. Acesso em: 21 jan. 2026.