Geodesic
Automorphisms of a~free group of infinite rank
Algebra i analiz, Tome 19 (2007) no. 2, pp. 74-85.

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The problem of classifying the automorphisms of a free group of infinite countable rank is investigated. Quite a reasonable generating set for the group $\mathrm{Aut}F_{\infty}$ is described. Some new subgroups of this group and structural results for them are presented. The main result says that the group of all automorphisms is generated (modulo the $IA$-automorphisms) by strings and lower triangular automorphisms.
Keywords: Free group of infinite rank, automorphism group, string. 
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C. K. Gupta; W. Hołubowski. Automorphisms of a~free group of infinite rank. Algebra i analiz, Tome 19 (2007) no. 2, pp. 74-85. http://geodesic.mathdoc.fr/item/AA_2007_19_2_a3/

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