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Translated from Matematicheskie Zametki, Vol., 53, No. 4, pp. 111–130, April, 1993.
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Smirnov, O.I. The Jackson theorem inL 2 for Christenson-Levy systems. Math Notes 53, 430–442 (1993). https://doi.org/10.1007/BF01210227
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DOI: https://doi.org/10.1007/BF01210227