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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 11, No. 5, pp. 1107–1120, September–October, 1970.
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Ponomarenko, V.G., Timan, M.F. Constructive characteristics of certain classes of periodic functions of several variables. Sib Math J 11, 823–832 (1970). https://doi.org/10.1007/BF00967842
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DOI: https://doi.org/10.1007/BF00967842