MING, R. Yue Chi. On von Neumann regular rings - II. Mathematica Scandinavica, Berkeley, CA, United States, v. 39, p. 167–170, 1976. DOI: 10.7146/math.scand.a-11654. Disponível em: https://journals.msp.org/mscand/article/view/1990. Acesso em: 25 jul. 2026.