REYES, G. E.; WRAITH, G. C. A note on tangent bundles in a category with a ring object. Mathematica Scandinavica, Berkeley, CA, United States, v. 42, p. 53–63, 1978. DOI: 10.7146/math.scand.a-11736. Disponível em: https://journals.msp.org/mscand/article/view/1909. Acesso em: 25 jul. 2026.