Gurjar, RV, “Affine lines on affine surfaces and the makar-limanov invariant”, Canadian Journal of Mathematics-Journal Canadien de Mathematiques, 60:1 (2008), 109
Maciej Borodzik, Henryk Żołądek, “Complex algebraic plane curves via the Poincaré–Hopf formula, I: Parametric lines”, Pacific J Math, 229:2 (2007), 307
De Bobadilla J.F., Luengo I., Melle-Hernandez A., Nemethi A., “On rational cuspidal plane curves, open surfaces and local singularities”, Singularity Theory, 2007, 411–442
Keita Tono, “On the number of the cusps of cuspidal plane curves”, Math Nachr, 278:1-2 (2005), 216
Flenner, H, “Rational cuspidal plane curves of type (d, d-3)”, Mathematische Nachrichten, 210 (2000), 93