IMANBAYEVA, A. Содержание 1 (56) 2016. Recent Contributions to Physics, [S. l.], v. 56, n. 1, p. 128–132, 2016. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/933. Acesso em: 7 дек. 2025.