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Moscow Institute for Railroad Transport Engineering. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 21, No. 1, pp. 74–75, January–March, 1987.
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Grigorchuk, R.I. Superamenability and the problem of occurrence of free semigroups. Funct Anal Its Appl 21, 64–66 (1987). https://doi.org/10.1007/BF01077990
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DOI: https://doi.org/10.1007/BF01077990