@article{IM2_1972_6_1_a5,
     author = {A. M. Samoilenko},
     title = {On the reduction to canonical form of a~dynamical system in the neighborhood of a~smooth invariant torus},
     journal = {Izvestiya. Mathematics },
     pages = {211--234},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1972_6_1_a5/}
}