Baltag Valeriu

Publications in Math-Net.Ru

1. Sufficient $GL(2, \mathbb{R})$-invariant center conditions for some classes of two-dimensional cubic differential systems
   
   Bul. Acad. Ştiinţe Repub. Mold. Mat., 2019, no. 2,  127–136
2. The transvectants and the integrals for Darboux systems of differential equations
   
   Bul. Acad. Ştiinţe Repub. Mold. Mat., 2008, no. 1,  4–18
3. Algebraic equations with invariant coefficients in qualitative study of the polynomial homogeneous differential systems
   
   Bul. Acad. Ştiinţe Repub. Mold. Mat., 2003, no. 2,  13–27
4. An integral of Malkin type and new cases of the center of a fractionally-cubic differential equation
   
   Differ. Uravn., 20:4 (1984),  555–562