IMANBAYEVA, A. Содержание 2 (53) 2015. Recent Contributions to Physics, [S. l.], v. 53, n. 2, p. 146–147, 2015. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/956. Acesso em: 6 дек. 2025.