JONDRUP, S. On Finitely Generated Flat Modules. Mathematica Scandinavica, Berkeley, CA, United States, v. 26, p. 233–240, 1970. DOI: 10.7146/math.scand.a-10979. Disponível em: https://journals.msp.org/mscand/article/view/2347. Acesso em: 25 jul. 2026.