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Translated from Kibernetika i Sistemnyi Analiz, No. 6, pp. 172–174, November–December, 1992.
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Burdyuk, V.Y., Burdyuk, I.V. Discrete and continuous metric spaces. Cybern Syst Anal 28, 950–952 (1992). https://doi.org/10.1007/BF01291301
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DOI: https://doi.org/10.1007/BF01291301