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@article{MZ_1980__170_172903, author = {Wilhelm Magnus}, title = {Rings of {Fricke} {Characters} and {Automorphism} {Groups} of {Free} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {91--104}, publisher = {mathdoc}, volume = {170}, year = {1980}, zbl = {0433.20033}, url = {http://geodesic.mathdoc.fr/item/MZ_1980__170_172903/} }
Wilhelm Magnus. Rings of Fricke Characters and Automorphism Groups of Free Groups.. Mathematische Zeitschrift, Tome 170 (1980), pp. 91-104. http://geodesic.mathdoc.fr/item/MZ_1980__170_172903/