ZHOROVINA, Tamara N. Edmund Ivanovich Zverovich. Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 1, p. 61–62, 2017. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/739. Acesso em: 18 jul. 2026.