The Polypermutation Group of an Associative Ring. Contemporary Mathematics , [S. l.], v. 2, n. 1, p. 15–23, 2021. DOI: 10.37256/cm.212021456. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/456. Acesso em: 24 dec. 2025.