@article{FAA_1984_18_4_a5,
     author = {S. E. Burkov and Ya. G. Sinai},
     title = {Rotation numbers that have nothing to do with the {KAM} theory},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {73--74},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1984_18_4_a5/}
}