ARMENDARIZ, Efraim P. On infinite periodic rings. Mathematica Scandinavica, Berkeley, CA, United States, v. 59, p. 5–8, 1986. DOI: 10.7146/math.scand.a-12149. Disponível em: https://journals.msp.org/mscand/article/view/1523. Acesso em: 25 jul. 2026.