@article{TM_1997_216_a4,
     author = {A. V. Bolsinov and A. T. Fomenko},
     title = {On the dimension of the space of integrable {Hamiltonian} systems with two degrees of freedom},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {45--69},
     publisher = {mathdoc},
     volume = {216},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1997_216_a4/}
}