NIELSEN, Lars Tyge. Transversality and the inverse image of a submanifold with corners. MATHEMATICA SCANDINAVICA, [S. l.], v. 49, p. 211–221, 1981. DOI: 10.7146/math.scand.a-11931. Disponível em: https://www.mscand.dk/article/view/11931. Acesso em: 5 dec. 2025.