IMANBAYEVA, A. Содержание 2 (57) 2016. Recent Contributions to Physics, [S. l.], v. 57, n. 2, p. 117–118, 2016. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/928. Acesso em: 13 май. 2025.