MathSciNet bibliographic data MR1262704 (95b:42016) 42B15 (47B38) Lebedev, V.; Olevskiĭ, A. \$C\sp 1\$$C\sp 1$ changes of variable: Beurling-Helson type theorem and Hörmander conjecture on Fourier multipliers. Geom. Funct. Anal. 4 (1994), no. 2, 213–235. Article

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