MATEIKO, Oleg M. Sergey Aleksandrovich Samalʼ. Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 1, p. 109–110, 2018. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/893. Acesso em: 18 jul. 2026.