EKHOLM, Tobias; KUTZSCHEBAUCH, Frank. Total curvature and area of curves with cusps and of surface maps. Mathematica Scandinavica, Berkeley, CA, United States, v. 96, n. 2, p. 224–242, 2005. DOI: 10.7146/math.scand.a-14954. Disponível em: https://journals.msp.org/mscand/article/view/743. Acesso em: 24 jul. 2026.