%0 Journal Article %A A. O. Ignatyev %T On the Existence of Homoclinic Orbits in Nonautonomous Second-Order Differential Equations %J Matematičeskie zametki %D 2020 %P 391-399 %V 107 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2020_107_3_a5/ %G ru %F MZM_2020_107_3_a5