MathSciNet bibliographic data MR1401764 42A55 (42A61) Berkes, István On the convergence of $\sum c_nf(nx)$$\sum c_nf(nx)$ and the ${\rm Lip}\ 1/2$${\rm Lip}\ 1/2$ class. Trans. Amer. Math. Soc. 349 (1997), no. 10, 4143–4158. Article

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