| Issue |
Section |
Title |
File |
| Vol 486, No 2 (2019) |
Mathematics |
The reduction of the degree of integrals of hamiltonian systems with the help of billiards |
(Rus)
|
| Vol 488, No 5 (2019) |
Mathematics |
Topological obstacles to the realizability of integrable Hamiltonian systems by billiards |
(Rus)
|
