KAZNU, J. Содержание 1 (28) 2009. Recent Contributions to Physics, [S. l.], v. 28, n. 1, p. 116–117, 2021. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/1523. Acesso em: 11 дек. 2025.