On a Nonsingular Equation of Length 9 Over Torsion Free Groups. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 12, n. 2, p. 590–604, 2019. DOI: 10.29020/nybg.ejpam.v12i2.3405. Disponível em: https://ejpam.com/index.php/ejpam/article/view/3405.. Acesso em: 3 may. 2024.