S. A. Kas'yanyuk, “Letter to the Editor”, Mat. Sb. (N.S.), 1959, Volume 47(89), Number 1,Pages <nobr>141

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Mat. Sb. (N.S.), 1959 Volume 47(89), Number 1, Pages 141–142 (Mi sm4864)

Letter to the Editor

S. A. Kas'yanyuk

Received: 25.08.1958

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