@article{ZVMMF_2015_55_1_a5,
     author = {N. A. Lyul'ko},
     title = {Instability of a nonlinear system of two oscillators under main and combination resonances},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {56--73},
     publisher = {mathdoc},
     volume = {55},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2015_55_1_a5/}
}