A. B. Korchagin, “Newtonian and affine classifications of irreducible cubics”, Algebra i Analiz, 24:5 (2012), 94–123; St. Petersburg Math. J., 24:5 (2013), 759–781
A. B. Korchagin, G. M. Polotovskii, “On positions of a real plane quintic relative to a couple of lines”, Algebra i Analiz, 21:2 (2009), 92–112; St. Petersburg Math. J., 21:2 (2010), 231–244