@article{ZVMMF_1966_6_5_a4,
     author = {N. K. Ibragimova},
     title = {On the stability of certain systems under resonance conditions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {842--860},
     year = {1966},
     volume = {6},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1966_6_5_a4/}
}