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Translated from Kibernetika, No. 1, pp. 12–16, January–February, 1980.
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Lisovik, L.P. Strict sets and finite semigroup coverings. Cybern Syst Anal 16, 13–17 (1980). https://doi.org/10.1007/BF01099355
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DOI: https://doi.org/10.1007/BF01099355