%0 Journal Article %A T. A. Yakovleva %T On the nonrigidity of an equilibrium position of a system whose potential energy does not have a minimum %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1994 %P 74-76 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1994_6_a15/ %G ru %F VMUMM_1994_6_a15