The case of conditional stability for a singularly perturbed Noetherian boundary value problems. Neliniini Kolyvannya, [S. l.], v. 2, n. 2, p. 194–208, 1999. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/54. Acesso em: 22 jan. 2026.