OLIVER, Robert. The Whitehead transfer homomorphism for oriented $S^1$-bundles. MATHEMATICA SCANDINAVICA, [S. l.], v. 57, p. 51–104, 1985. DOI: 10.7146/math.scand.a-12106. Disponível em: https://www.mscand.dk/article/view/12106. Acesso em: 5 dec. 2025.