AUDOUX, B.; BELLINGERI, P.; MEILHAN, J.-B.; WAGNER, E. Homotopy classification of ribbon tubes and welded string links. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 17, n. 2, p. 713-761, 2017. DOI: 10.2422/2036-2145.201507_003. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/511. Acesso em: 27 may. 2025.