@article{DE_1994_30_5_a5,
     author = {A. M. Samoilenko and Yu. V. Teplinskii},
     title = {On the smoothness of an invariant torus of a countable linear extension of a dynamical system on an $m$-dimensional torus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {781--790},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_5_a5/}
}