IMANBAYEVA, A. Содержание 4 (55) 2015. Recent Contributions to Physics, [S. l.], v. 55, n. 4, p. 148–152, 2015. Disponível em: https://bph.kaznu.kz/index.php/zhuzhu/article/view/934. Acesso em: 7 дек. 2025.