%0 Journal Article %A K. F. Voitsekhovskaya %T Stability of second-order dynamic systems %J Doklady Akademii Nauk %D 1969 %P 1061-1064 %V 184 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1969_184_5_a11/ %G ru %F DAN_1969_184_5_a11