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@article{MAN_1933__107_159599, author = {B. Neumann}, title = {Die {Automorphismengruppe} der freien {Gruppen}}, journal = {Mathematische Annalen}, pages = {367--386}, publisher = {mathdoc}, volume = {107}, year = {1933}, zbl = {0005.24402}, url = {http://geodesic.mathdoc.fr/item/MAN_1933__107_159599/} }
B. Neumann. Die Automorphismengruppe der freien Gruppen. Mathematische Annalen, Tome 107 (1933), pp. 367-386. http://geodesic.mathdoc.fr/item/MAN_1933__107_159599/