Geodesic
Note on Automorphisms of a Free Abelian Group
Canadian mathematical bulletin, Tome 23 (1980) no. 1, pp. 111-113

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Let F be a free group. Denote by the quotient group by the commutator subgroup which is a free abelian group. The fact that the natural map from Aut(F) into Aut() is an epimorphism, in case when F is finitely generated, was known as a consequence of the theory of Nielsen transformations ([2]) Proposition 4.4 and [3] Corollary 3.5.1). 
Macedońska-Nosalska, Olga. Note on Automorphisms of a Free Abelian Group. Canadian mathematical bulletin, Tome 23 (1980) no. 1, pp. 111-113. doi: 10.4153/CMB-1980-016-6
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     title = {Note on {Automorphisms} of a {Free} {Abelian} {Group}},
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     year = {1980},
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