IMANBAYEVA, A. Содержание 1 (40) 2012. Recent Contributions to Physics, [S. l.], v. 40, n. 1, p. 71–73, 2012. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/879. Acesso em: 6 дек. 2025.