DUPONT, J. L. Symplectic Bundles and $KR$-Theory. MATHEMATICA SCANDINAVICA, [S. l.], v. 24, p. 27–30, 1969. DOI: 10.7146/math.scand.a-10918. Disponível em: https://www.mscand.dk/article/view/10918. Acesso em: 7 may. 2024.