%0 Journal Article %A L. D. Akulenko %T Resonant motions in a substantially non-linear system with one degree of freedom in the critical case %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1967 %P 1379-1385 %V 7 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZVMMF_1967_7_6_a15/ %G ru %F ZVMMF_1967_7_6_a15