Landa S E

Publications in Math-Net.Ru

1. An equivalence condition for dynamical systems on two-dimensional manifolds
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1977, no. 8,  102–104
2. Direction fields on 2-manifolds
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1975, no. 7,  80–91