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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 11, No, 5, pp. 1140–1145, September–October, 1970.
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Telyakovskii, S.A. The integral modulus of continuity of functions with quasiconvex fourier coefficients. Sib Math J 11, 847–851 (1970). https://doi.org/10.1007/BF00967844
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DOI: https://doi.org/10.1007/BF00967844