JONDRUP, S.; SMALL, L. W. Power Series over Coherent Rings. Mathematica Scandinavica, Berkeley, CA, United States, v. 35, p. 21–24, 1974. DOI: 10.7146/math.scand.a-11530. Disponível em: https://journals.msp.org/mscand/article/view/2117. Acesso em: 25 jul. 2026.