Baidabekov А. Scheme for obtaining a four-to-four-digit correspondence. Рroblems of engineering and professional education, [S. l.], v. 16, n. 1, p. 2–3, 2023. DOI: 10.32523/2220-685X-2013-16-1-2-3. Disponível em: https://bulprengpe.enu.kz/index.php/main/article/view/452. Acesso em: 14 may. 2024.