KASYMOV, K. A.; NURGABYL, D. N. Asymptotic Behavior of Solutions of Linear Singularly Perturbed General Separated Boundary-Value Problems with Initial Jump. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 11, p. 1476–1488, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4018. Acesso em: 6 dec. 2025.