IMANBAYEVA, A. Содержание 2 (61) 2017. Recent Contributions to Physics, [S. l.], v. 61, n. 2, p. 147–150, 2017. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/891. Acesso em: 6 дек. 2025.