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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 6, pp. 793–796, November–December, 1987.
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Nguen-Byong An optimization problem. Ukr Math J 39, 648–650 (1987). https://doi.org/10.1007/BF01062900
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DOI: https://doi.org/10.1007/BF01062900