A remark on Denjoy's inequality and Herman's theorem
Publications Mathématiques de l'IHÉS, Tome 49 (1979), pp. 235-241. 
@article{PMIHES_1979__49__235_0,
     author = {Carleson, Lennart},
     title = {A remark on {Denjoy's} inequality and {Herman's} theorem},
     journal = {Publications Math\'ematiques de l'IH\'ES},
     pages = {235--241},
     publisher = {Institut des Hautes \'Etudes Scientifiques},
     volume = {49},
     year = {1979},
     mrnumber = {81h:58040},
     zbl = {0446.58014},
     language = {en},
     url = {http://archive.numdam.org/item/PMIHES_1979__49__235_0/}
}
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Carleson, Lennart. A remark on Denjoy's inequality and Herman's theorem. Publications Mathématiques de l'IHÉS, Tome 49 (1979), pp. 235-241. http://archive.numdam.org/item/PMIHES_1979__49__235_0/

[1] Herman, Sur la conjugaison différentiable des difféomorphismes du cercle à des rotations, Publ. Math. I.H.E.S, 49 (1979), p. 1-233. | Numdam | MR | Zbl