%0 Journal Article %A B. A. Shcherbakov %A L. V. Koreneva %T The preservation of the nature of the recurrence of the solutions of differential equations under perturbations %J Differencialʹnye uravneniâ %D 1974 %P 470-475 %V 10 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1974_10_3_a8/ %G ru %F DE_1974_10_3_a8