@article{RM_1989_44_1_a3,
     author = {Ya. G. Sinai and K. M. Khanin},
     title = {Smoothness of conjugacies of diffeomorphisms of the circle with rotations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {69--99},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1989_44_1_a3/}
}