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@article{FAA_1987_21_1_a10, author = {R. I. Grigorchuk}, title = {Superamenability and the problem of occurrence of free semigroups}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {74--75}, publisher = {mathdoc}, volume = {21}, number = {1}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_1_a10/} }
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/
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