OGER, Francis. Cancellation of Abelian groups of finite rank modulo elementary equivalence. Mathematica Scandinavica, Berkeley, CA, United States, v. 67, p. 5–14, 1990. DOI: 10.7146/math.scand.a-12315. Disponível em: https://journals.msp.org/mscand/article/view/1362. Acesso em: 24 jul. 2026.