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Translated from Matematicheskie Zametki, Vol. 43, No. 2, pp. 197–211, February, 1988.
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Galeev, É.M. Orders of the orthoprojection widths of classes of periodic functions of one and of several variables. Mathematical Notes of the Academy of Sciences of the USSR 43, 110–118 (1988). https://doi.org/10.1007/BF01152547
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DOI: https://doi.org/10.1007/BF01152547