@article{DAN_1981_258_2_a12,
     author = {B. I. Kryukov and G. I. Seredovich},
     title = {``Strange'' behavior of solutions of the {Duffing} equations},
     journal = {Doklady Akademii Nauk},
     pages = {311--314},
     publisher = {mathdoc},
     volume = {258},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_258_2_a12/}
}