Real-Two-Dimensional Representations of Two-Generator Free Groups. Norman Purzitsky — 1972 Mathematische Zeitschrift
Quasi Fricke Polygons and the Nielsen Convex Region. Norman Purzitsky — 1980 Mathematische Zeitschrift
Two Generator Fuchsian Groups of Genus One. Gerhard Rosenberger; Norman Purzitsky — 1972 Mathematische Zeitschrift
Correction to "Two Generator Fuchsian Groups of Genus One". Gerhard Rosenberger; Norman Purzitsky — 1973 Mathematische Zeitschrift