COX, David 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://tidsskrift.dk/math/article/view/11749. Acesso em: 13 aug. 2026.