STROMME, Stein Arild. A note on $\tau$-constant families of plane curves. MATHEMATICA SCANDINAVICA, [S. l.], v. 55, p. 62–66, 1984. DOI: 10.7146/math.scand.a-12067. Disponível em: https://tidsskrift.dk/math/article/view/12067. Acesso em: 14 aug. 2026.