Umanskii Ya L

Publications in Math-Net.Ru

1. Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of $\mathbb R^2$ in extended neighbourhoods of simple singular points. III. Realization
   
   Mat. Sb., 186:10 (1995),  89–102
2. Isoenergetic classification of integrable Hamiltonian systems in a neighborhood of a simple elliptic point
   
   Mat. Zametki, 55:5 (1994),  88–97
3. Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of $\mathbb{R}^2$ in extended neighborhoods of simple singular points. II
   
   Mat. Sb., 184:4 (1993),  105–138
4. Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of $\mathbb{R}^2$ in extended neighborhoods of simple singular points. I
   
   Mat. Sb., 183:12 (1992),  141–176
5. Necessary and sufficient conditions for topological equivalence of three-dimensional Morse–Smale dynamical systems with a finite number of singular trajectories
   
   Mat. Sb., 181:2 (1990),  212–239
6. Necessary conditions for the existence of heteroclinic trajectories in an integral Hamiltonian system with two degrees of freedom
   
   Uspekhi Mat. Nauk, 38:5(233) (1983),  195–196
7. Decomposition of $n$-dimensional manifolds into simple manifolds
   
   Izv. Vyssh. Uchebn. Zaved. Mat., 1979, no. 1,  46–50
8. The scheme of a three-dimensional Morse–Smale dynamical system without closed trajectories
   
   Dokl. Akad. Nauk SSSR, 230:6 (1976),  1286–1289
9. Regular components of homeomorphisms on $n$-dimensional manifolds
   
   Izv. Akad. Nauk SSSR Ser. Mat., 38:6 (1974),  1324–1342