@article{SM_1995_81_2_a7,
     author = {A. V. Bolsinov and A. T. Fomenko},
     title = {Orbital equivalence of integrable {Hamiltonian} systems with two degrees of freedom. {A~classification} {theorem.~I}},
     journal = {Sbornik. Mathematics},
     pages = {421--465},
     publisher = {mathdoc},
     volume = {81},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_81_2_a7/}
}