@article{MZ_1976__147_172322,
     author = {Norman Purzitsky},
     title = {All {Two-Gnerator} {Fuchsian} {Group.}},
     journal = {Mathematische Zeitschrift},
     pages = {87--92},
     publisher = {mathdoc},
     volume = {147},
     year = {1976},
     zbl = {0305.20025},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__147_172322/}
}