@article{VMUMM_1999_3_a13,
     author = {T. A. Yakovleva},
     title = {On conditions for the rigidity of steady motions of mechanical systems with cyclic coordinates},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {51--52},
     publisher = {mathdoc},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1999_3_a13/}
}