Groupes with free 2-generator subsemigroups.
G. Baumslag, Y. Roitberg (1982)
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G. Baumslag, Y. Roitberg (1982)
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L. Makar-Limanov (1984)
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R. M. Capocelli (1977/78)
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Z. Hedrlin, P. Goralcik (1970)
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P.R. Misra (1996)
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I. Levi, G.R. Wood (1984)
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J.E. Ault (1974)
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J.R. Gard (1975)
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E. Hotzel (1995)
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A.A. Markov (1971)
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