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@article{MZ_1980__172_172960, author = {Norman Purzitsky}, title = {Quasi {Fricke} {Polygons} and the {Nielsen} {Convex} {Region.}}, journal = {Mathematische Zeitschrift}, pages = {239--244}, publisher = {mathdoc}, volume = {172}, year = {1980}, zbl = {0417.30038}, url = {http://geodesic.mathdoc.fr/item/MZ_1980__172_172960/} }
Norman Purzitsky. Quasi Fricke Polygons and the Nielsen Convex Region.. Mathematische Zeitschrift, Tome 172 (1980), pp. 239-244. http://geodesic.mathdoc.fr/item/MZ_1980__172_172960/