BIYAROV, B.; SVISTUNOV, D.; ABDRASHEVA, G. Correct Singular Perturbations of the Laplace Operator. Eurasian Mathematical Journal, [S. l.], v. 11, n. 4, 2024. Disponível em: https://emj.enu.kz/index.php/main/article/view/193. Acesso em: 5 oct. 2024.