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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 18, No. 2, p. 476, March–April, 1977.
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Koledov, L.V. Letter to the editor. Sib Math J 18, 341 (1977). https://doi.org/10.1007/BF00967174
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DOI: https://doi.org/10.1007/BF00967174