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Translated from Kibernetika, No. 3, pp. 149–151, May–June, 1977.
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Negru, I.S., Tseitlin, G.E. Fourth All-Union Conference on Mathematical Logic. Cybern Syst Anal 13, 469–472 (1977). https://doi.org/10.1007/BF01069671
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DOI: https://doi.org/10.1007/BF01069671