JONDRUP, S.; SMALL, L. W. Power Series over Coherent Rings. MATHEMATICA SCANDINAVICA, [S. l.], v. 35, p. 21–24, 1974. DOI: 10.7146/math.scand.a-11530. Disponível em: https://tidsskrift.dk/math/article/view/11530. Acesso em: 14 aug. 2026.