NIELSEN, Lars Tyge. Transversality and the inverse image of a submanifold with corners. Mathematica Scandinavica, Berkeley, CA, United States, v. 49, p. 211–221, 1981. DOI: 10.7146/math.scand.a-11931. Disponível em: https://journals.msp.org/mscand/article/view/1741. Acesso em: 25 jul. 2026.