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Translated from Kibernetika, No. 2, pp. 54–58, March–April, 1973.
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L'vov, M.S. Commutative closure of regular semigroups of languages. Cybern Syst Anal 9, 247–252 (1973). https://doi.org/10.1007/BF01069078
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DOI: https://doi.org/10.1007/BF01069078