@article{RM_1990_45_2_a1,
     author = {A. V. Bolsinov and S. V. Matveev and A. T. Fomenko},
     title = {Topological classification of integrable {Hamiltonian} systems with two degrees of freedom. {List} of systems of small complexity},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {59--94},
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1990_45_2_a1/}
}