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Additional information
Khar'kov. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 32, No. 1, pp. 186–189, January–February, 1991.
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Kadets, V.M. Direct sum of normed spaces. Sib Math J 32, 151–154 (1991). https://doi.org/10.1007/BF00970176
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DOI: https://doi.org/10.1007/BF00970176