@article{DAN_1972_202_3_a16,
     author = {A. M. Vershik and L. D. Faddeev},
     title = {Differential geometry and {Lagrangian} mechanics with constraints},
     journal = {Doklady Akademii Nauk},
     pages = {555--557},
     publisher = {mathdoc},
     volume = {202},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_3_a16/}
}