IMANBAYEVA, A. Содержание 1 (52) 2015. Recent Contributions to Physics, [S. l.], v. 52, n. 1, p. 130–133, 2015. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/969. Acesso em: 10 дек. 2025.