JONDRUP, S.; TROSBORG, P. J. A Remark on Pure Ideals and Projective Modules. Mathematica Scandinavica, Berkeley, CA, United States, v. 35, p. 16–20, 1974. DOI: 10.7146/math.scand.a-11529. Disponível em: https://journals.msp.org/mscand/article/view/2110. Acesso em: 25 jul. 2026.