@article{VNGU_2010_10_3_a0,
     author = {V. P. Golubyatnikov and I. V. Golubyatnikov},
     title = {On {Periodic} {Trajectories} of {Nonlinear} {Dynamical} {Systems} of a {Special} {Type}},
     journal = {Sibirskij \v{z}urnal \v{c}istoj i prikladnoj matematiki},
     pages = {3--16},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VNGU_2010_10_3_a0/}
}