@article{VUU_2020_30_4_a9,
     author = {O. V. Kholostova},
     title = {On the motions of a near-autonomous hamiltonian system in the cases of two zero frequencies},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {672--695},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2020_30_4_a9/}
}