MATEIKO, Oleg M. Nikolai Nikolaevich Trush. Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 1, p. 105–106, 2018. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/891. Acesso em: 19 jul. 2026.