%0 Journal Article %A B. I. Medvedev %T An asymptotic solution of ordinary second order differential equations %J Differencialʹnye uravneniâ %D 1971 %P 2111-2114 %V 7 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_11_a23/ %G ru %F DE_1971_7_11_a23