FADELL, Edward; NEUWIRTH, Lee. Configuration Spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 10, p. 111–118, 1962. DOI: 10.7146/math.scand.a-10517. Disponível em: https://tidsskrift.dk/math/article/view/10517. Acesso em: 14 aug. 2026.