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Translated from Matematicheskie Zametki, Vol. 25, No. 3, pp. 321–328, March, 1979.
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Gusev, A.I. Best approximation in normed modules over semifields. Mathematical Notes of the Academy of Sciences of the USSR 25, 167–171 (1979). https://doi.org/10.1007/BF01159506
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DOI: https://doi.org/10.1007/BF01159506