STROMME, Stein Arild. A note on $\tau$-constant families of plane curves. Mathematica Scandinavica, Berkeley, CA, United States, v. 55, p. 62–66, 1984. DOI: 10.7146/math.scand.a-12067. Disponível em: https://journals.msp.org/mscand/article/view/1601. Acesso em: 25 jul. 2026.