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Translated from Matematicheskie Zametki, vol. 80, no. 2, 2006, p. 320.
Original Russian Text Copyright © 2006 by A. V. Dmitruk, N. V. Kuz’kina.
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Dmitruk, A.V., Kuz’kina, N.V. Letter to the Editor. Math Notes 80, 309 (2006). https://doi.org/10.1007/s11006-006-0141-4
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DOI: https://doi.org/10.1007/s11006-006-0141-4