KALIMBETOV, B.T.; SAPAKOV, D.A. Asymptotics solving singularly perturbed integro-differential systems with parametric amplification. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 80, n. 4, p. 86–90, 2015. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/65. Acesso em: 10 jul. 2025.