COX, David A. Algebraic tubular neighbourhoods I. Mathematica Scandinavica, Berkeley, CA, United States, v. 42, p. 211–228, 1978. DOI: 10.7146/math.scand.a-11749. Disponível em: https://journals.msp.org/mscand/article/view/1897. Acesso em: 25 jul. 2026.