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Translated from Matematicheskie Zametki, Vol. 24, No. 2, p. 300, August, 1978.
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Proizvolov, V.V. Letter to the editor. Mathematical Notes of the Academy of Sciences of the USSR 24, 661 (1978). https://doi.org/10.1007/BF01105324
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DOI: https://doi.org/10.1007/BF01105324