Literature Cited
Yu. I. Khmelevskii, “Equations in free semigroups,” Tr. Matem. Inst. Akad. Nauk SSSR, 107 (1971).
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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 15, No. 5, pp. 1131–1137, September–October, 1974.
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Durnev, V.G. Positive formulas in free semigroups. Sib Math J 15, 796–800 (1974). https://doi.org/10.1007/BF00966439
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DOI: https://doi.org/10.1007/BF00966439