%0 Journal Article %A B. S. Kalitin %T Instability of Closed Invariant Sets of Semidynamical Systems. Method of Sign-Constant Lyapunov Functions %J Matematičeskie zametki %D 2009 %P 382-394 %V 85 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2009_85_3_a6/ %G ru %F MZM_2009_85_3_a6