%0 Journal Article %A G. M. Vinner %T Stability of the equilibrium of a mechanical system with unilateral constraints %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1989 %P 54-57 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1989_4_a12/ %G ru %F VMUMM_1989_4_a12