@article{DAN_1997_354_5_a12,
     author = {V. I. Yudovich},
     title = {Vibration dynamics of systems with constraints},
     journal = {Doklady Akademii Nauk},
     pages = {622--624},
     publisher = {mathdoc},
     volume = {354},
     number = {5},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1997_354_5_a12/}
}