@article{MAT_1962_6_5_a5,
     author = {J. Moser},
     title = {On invariant curves of area-preserving mapping of an annulus},
     journal = {Matematika},
     pages = {51--68},
     publisher = {mathdoc},
     volume = {6},
     number = {5},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1962_6_5_a5/}
}