LEONTIEV, V. K.; MOVSISYAN, Gh. L. Algebraic communication channels. Armenian Journal of Mathematics, Yerevan, Armenia, v. 1, n. 3, p. pp. 1–6, 2008. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/40. Acesso em: 4 apr. 2025.