WEINER, Joel L. A spherical Fabricius-Bjerre formula with applications to closed space curves. Mathematica Scandinavica, Berkeley, CA, United States, v. 61, p. 286–291, 1987. DOI: 10.7146/math.scand.a-12205. Disponível em: https://journals.msp.org/mscand/article/view/1465. Acesso em: 25 jul. 2026.