@article{UFA_2021_13_3_a12,
     author = {M. G. Yumagulov and L. S. Ibragimova and A. S. Belova},
     title = {Perturbation theory methods in problem of parametric resonance for linear periodic {Hamiltonian} systems},
     journal = {Ufa mathematical journal},
     pages = {174--190},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2021_13_3_a12/}
}