@article{TRSPY_1994_205_a4,
     author = {A. V. Bolsinov and A. T. Fomenko and X. Zhang},
     title = {Three types bordisms of integrable systems with two degrees of freedom. {Computation} of bordism groups},
     journal = {Informatics and Automation},
     pages = {32--72},
     publisher = {mathdoc},
     volume = {205},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1994_205_a4/}
}