@article{GDZPPN002415739, title = {A Modular Group and Riemann Surfaces of Genus 2.}, journal = {Mathematische Zeitschrift}, volume = {142}, year = {1975}, pages = {205-220}, zbl = {0286.32016}, url = {http://dml.mathdoc.fr/item/GDZPPN002415739} }
Keen, Linda. A Modular Group and Riemann Surfaces of Genus 2.. Mathematische Zeitschrift, Tome 142 (1975) pp. 205-220. http://gdmltest.u-ga.fr/item/GDZPPN002415739/