ATABEKYAN, Varujan. Normal Subgroups in Free Burnside Groups of Odd Period. Armenian Journal of Mathematics, Yerevan, Armenia, v. 1, n. 2, p. pp. 25–29, 2008. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/24. Acesso em: 3 apr. 2025.