MathSciNet bibliographic data MR1814115 (2002f:37072) 37E10 (37C05 37C20 37E45) Slammert, Lionel \$C\sp 1\$$C\sp 1$ smoothness of Liouville arcs in Arnolʹd tongues. Proc. Amer. Math. Soc. 129 (2001), no. 6, 1817–1823 (electronic). Article

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