On train algebras of degree 2 and exponent 4. Gulf Journal of Mathematics, [S. l.], v. 13, n. 1, p. 41–53, 2022. DOI: 10.56947/gjom.v13i1.926. Disponível em: https://gjom.org/index.php/gjom/article/view/926. Acesso em: 14 oct. 2026.