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Small denominators. I: Mappings of the circumference onto itself. (English. Russian original) Zbl 0152.41905

Am. Math. Soc., Transl., II. Ser. 46, 213-284 (1965); translation from Izv. Akad. Nauk SSSR, Ser. Mat. 25, 21-86 (1961).

Keywords:

mechanics
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