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@article{MZ_1972__127_171758, author = {Norman Purzitsky}, title = {Real-Two-Dimensional {Representations} of {Two-Generator} {Free} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {95--104}, publisher = {mathdoc}, volume = {127}, year = {1972}, zbl = {0226.20051}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__127_171758/} }
Norman Purzitsky. Real-Two-Dimensional Representations of Two-Generator Free Groups.. Mathematische Zeitschrift, Tome 127 (1972), pp. 95-104. http://geodesic.mathdoc.fr/item/MZ_1972__127_171758/