@article{ZVMMF_1967_7_6_a15,
     author = {L. D. Akulenko},
     title = {Resonant motions in a substantially non-linear system with one degree of freedom in the critical case},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1379--1385},
     publisher = {mathdoc},
     volume = {7},
     number = {6},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1967_7_6_a15/}
}