%0 Journal Article %A I. G. Krosko %T Detection of stability of periodic flows with the aid of generalized characteristic numbers %J Differencialʹnye uravneniâ %D 1971 %P 1701-1703 %V 7 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_9_a18/ %G ru %F DE_1971_7_9_a18