@article{VMUMM_1994_6_a15,
     author = {T. A. Yakovleva},
     title = {On the nonrigidity of an equilibrium position of a system whose potential energy does not have a minimum},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {74--76},
     publisher = {mathdoc},
     number = {6},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1994_6_a15/}
}