@article{IM2_1993_41_1_a6,
     author = {S. I. Pidkuiko},
     title = {On the denseness of the set of nonintegrable hamiltonians},
     journal = {Izvestiya. Mathematics },
     pages = {143--155},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1993_41_1_a6/}
}