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Translated from Kibernetika i Sistemnyi Analiz, No. 5, pp. 15–25, September–October, 1998.
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German, O.V. Concerning existential definition of the classnp: Theoretical analysis of an alternative approach. Cybern Syst Anal 34, 645–652 (1998). https://doi.org/10.1007/BF02667036
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DOI: https://doi.org/10.1007/BF02667036