Geodesic
Superamenability and the problem of occurrence of free semigroups
Funkcionalʹnyj analiz i ego priloženiâ, Tome 21 (1987) no. 1, pp. 74-75

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     author = {R. I. Grigorchuk},
     title = {Superamenability and the problem of occurrence of free semigroups},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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     volume = {21},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_1_a10/}
}
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R. I. Grigorchuk. Superamenability and the problem of occurrence of free semigroups. Funkcionalʹnyj analiz i ego priloženiâ, Tome 21 (1987) no. 1, pp. 74-75. http://geodesic.mathdoc.fr/item/FAA_1987_21_1_a10/