SOROKOLETOVA, Olga N. Valentin Vikentʼevich Gorokhovik. Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 1, p. 93–95, 2019. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/934. Acesso em: 19 jul. 2026.