ÖSTLUND, O.-P. A diagrammatic approach to link invariants of finite degree. MATHEMATICA SCANDINAVICA, [S. l.], v. 94, n. 2, p. 295–319, 2004. DOI: 10.7146/math.scand.a-14444. Disponível em: https://www.mscand.dk/article/view/14444. Acesso em: 5 may. 2024.