@article{DAN_1964_158_2_a12,
     author = {M. V. Rein},
     title = {A general method of lowering the order of a {Hamiltonian} system with a known integral},
     journal = {Doklady Akademii Nauk},
     pages = {294--297},
     publisher = {mathdoc},
     volume = {158},
     number = {2},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_2_a12/}
}