ÖSTLUND, Olof-Petter. A diagrammatic approach to link invariants of finite degree. Mathematica Scandinavica, Berkeley, CA, United States, v. 94, n. 2, p. 295–319, 2004. DOI: 10.7146/math.scand.a-14444. Disponível em: https://journals.msp.org/mscand/article/view/775. Acesso em: 24 jul. 2026.