@article{DAN_1993_332_5_a1,
     author = {A. V. Bolsinov and A. T. Fomenko},
     title = {Trajectory classification of simple integrable {Hamiltonian} systems},
     journal = {Doklady Akademii Nauk},
     pages = {553--555},
     publisher = {mathdoc},
     volume = {332},
     number = {5},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_332_5_a1/}
}