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MATHEMATICS
On subsemigroups of free semigroups
L. N. Shevrin Ural State University, Sverdlovsk
Citation:
L. N. Shevrin, “On subsemigroups of free semigroups”, Dokl. Akad. Nauk SSSR, 133:3 (1960), 537–539
Linking options:
https://www.mathnet.ru/eng/dan28089 https://www.mathnet.ru/eng/dan/v133/i3/p537
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