@article{VMUMM_1995_3_a12,
     author = {R. Gatignol and N. Sibgatullin},
     title = {Canonical variables of a {Hamiltonian} system},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {70--75},
     publisher = {mathdoc},
     number = {3},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1995_3_a12/}
}