@article{DAN_1984_275_3_a15,
     author = {E. D. Belokolos and D. Ya. Petrina},
     title = {On the relation between the approximating {Hamiltonian} method and},
     journal = {Doklady Akademii Nauk},
     pages = {580--582},
     publisher = {mathdoc},
     volume = {275},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_275_3_a15/}
}