Zefirov Artem V

Publications in Math-Net.Ru

1. Generalized normal forms of the systems of ordinary differential equations with a quasi-homogeneous polynomial $(\alpha x_1^2+x_2, x_1 x_2)$ in the unperturbed part
   
   Vestnik of Saint Petersburg University. Mathematics. Mechanics. Astronomy, 8:1 (2021),  12–28