MATEJKO, Oleg M. Anatoly Afanasyevich Levakov . Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 3, p. 139–140, 2019. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/1055. Acesso em: 18 jul. 2026.