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Additional information
Dnepropetrovsk Chemical Engineering Institute. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 4, No. 3, pp. 97–98, July–September, 1970.
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Brudnyi, Y.A. Extension theorem. Funct Anal Its Appl 4, 252–253 (1970). https://doi.org/10.1007/BF01075247
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DOI: https://doi.org/10.1007/BF01075247