IMANBAYEVA, A. Содержание 2 (41) 2012. Recent Contributions to Physics, [S. l.], v. 2012, n. 2, p. 89–92, 2012. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/881. Acesso em: 15 дек. 2025.