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Additional information
Institute of Geological Physics and Mechanics, Academy of Sciences of the Kirghiz SSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 11, No. 2, pp. 58–66, April–June, 1977.
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Rvachev, M.A. A problem of Ulam type. Funct Anal Its Appl 11, 128–135 (1977). https://doi.org/10.1007/BF01081891
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DOI: https://doi.org/10.1007/BF01081891