On subsemigroups of free semigroups
Doklady Akademii Nauk, Tome 133 (1960) no. 3, pp. 537-539
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@article{DAN_1960_133_3_a9,
author = {L. N. Shevrin},
title = {On subsemigroups of free semigroups},
journal = {Doklady Akademii Nauk},
pages = {537--539},
year = {1960},
volume = {133},
number = {3},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_3_a9/}
}
L. N. Shevrin. On subsemigroups of free semigroups. Doklady Akademii Nauk, Tome 133 (1960) no. 3, pp. 537-539. http://geodesic.mathdoc.fr/item/DAN_1960_133_3_a9/