@article{ZNSL_1996_235_a2,
     author = {A. V. Bolsinov and A. T. Fomenko},
     title = {Exact topological classification of {Hamiltonian} flows on smooth two-dimensional surfaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {22--53},
     publisher = {mathdoc},
     volume = {235},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_235_a2/}
}