%0 Journal Article %A B. I. Kryukov %A G. I. Seredovich %T ``Strange'' behavior of solutions of the Duffing equations %J Doklady Akademii Nauk %D 1981 %P 311-314 %V 258 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1981_258_2_a12/ %G ru %F DAN_1981_258_2_a12