@article{IM2_1989_32_2_a6,
     author = {A. T. Fomenko and H. Zieschang},
     title = {On~typical topological properties of integrable {Hamiltonian} systems},
     journal = {Izvestiya. Mathematics},
     pages = {385--412},
     year = {1989},
     volume = {32},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1989_32_2_a6/}
}