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Translated from Matematicheskie Zametki, Vol. 51, No. 6, p. 155, June, 1992.
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Grigorenko, N.V. Letter to editor. Math Notes 51, 627 (1992). https://doi.org/10.1007/BF01263313
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DOI: https://doi.org/10.1007/BF01263313