MATEIKO, Oleg M. Mikalaj Viktaravich Lazakovich. Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 1, p. 111–112, 2018. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/894. Acesso em: 18 jul. 2026.