OLIVER, Robert. The Whitehead transfer homomorphism for oriented $S^1$-bundles. Mathematica Scandinavica, Berkeley, CA, United States, v. 57, p. 51–104, 1985. DOI: 10.7146/math.scand.a-12106. Disponível em: https://journals.msp.org/mscand/article/view/1561. Acesso em: 25 jul. 2026.