COX, D. A. Algebraic tubular neighbourhoods I. MATHEMATICA SCANDINAVICA, [S. l.], v. 42, p. 211–228, 1978. DOI: 10.7146/math.scand.a-11749. Disponível em: https://www.mscand.dk/article/view/11749. Acesso em: 28 apr. 2024.