1. Bibikov, P. “Differential Invariants and Contact Classification of Ordinary Differential Equations”, Lobachevskii J.Math. 36, No. 3, 245–249 (2015).
2. Kruglikov, B. S. “Point Classification of Second Order ODEs: Tresse Classification Revisited and Beyond”, Proceedings of the Fifth Abel Symposium, Tromso, Norway, June 17–22 (Springer, Berlin, 2009), 199–221.
3. Bibikov, P. “On Lie Problem and Differential Invariants of the Equations y = F(x, y)”, Func. Analyzis and Appl. (in press).
4. Bibikov, P., Malakhov, A. “On Lie Problem and Differential Invariats for the Subgroup of the Plane Cremona Group”, J. Geom. and Phys. (in press).
5. Bibikov, P., Lychagin, V. “GL2(C)–Orbits of Binary Rational Forms”, Lobachevskii J. Math. 32, No. 1, 94–101 (2011).