FUCHS, L.; VILJOEN, G. Quasi-Direct Decompositions of Torsion-Free Abelian Groups of Infinite Rank. Mathematica Scandinavica, Berkeley, CA, United States, v. 33, p. 205–212, 1973. DOI: 10.7146/math.scand.a-11484. Disponível em: https://journals.msp.org/mscand/article/view/2187. Acesso em: 25 jul. 2026.