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O. V. Bogopolskii, D. V. Puga, “Embedding the Outer Automorphism Group $\operatorname{Out}(F_n)$ of a Free Group of Rank $n$ in the Group $\operatorname{Out}(F_m)$ for $m>n$”, Algebra Logika, 41:2 (2002), 123–129 ; Algebra and Logic, 41:2 (2002), 69–73 |
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