%0 Journal Article %A G. S. Krechetov %T Lyapunov functions for a class of second-order autonomous systems %J Differencialʹnye uravneniâ %D 1988 %P 207-211 %V 24 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_2_a2/ %G ru %F DE_1988_24_2_a2