@article{VMUMM_1991_1_a12,
     author = {S. V. {\CYRK}irget{\cyro}va},
     title = {Some questions of the theory of perturbations of {Hamiltonian} systems with {Hamiltonian} in the form of a trigonometric polynomial},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {62--68},
     publisher = {mathdoc},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_1_a12/}
}