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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 40, No. 6, pp. 769–771, November–December, 1988.
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Al'ber, Y.I., Notik, A.I. Parallelogram inequalities in banach spaces and some properties of a dual mapping. Ukr Math J 40, 650–652 (1988). https://doi.org/10.1007/BF01057185
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DOI: https://doi.org/10.1007/BF01057185