GILMER, Robert; HEINZER, William. Cardinality of generating sets for modules over a commutative ring. Mathematica Scandinavica, Berkeley, CA, United States, v. 52, p. 41–57, 1983. DOI: 10.7146/math.scand.a-11992. Disponível em: https://journals.msp.org/mscand/article/view/1627. Acesso em: 25 jul. 2026.