IMANBAYEVA, A. Содержание 4 (59) 2016. Recent Contributions to Physics, [S. l.], v. 59, n. 4, p. 122–123, 2016. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/906. Acesso em: 5 дек. 2025.