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@article{MZ_1975__142_172198, author = {Linda Keen}, title = {A {Modular} {Group} and {Riemann} {Surfaces} of {Genus} 2.}, journal = {Mathematische Zeitschrift}, pages = {205--220}, publisher = {mathdoc}, volume = {142}, year = {1975}, zbl = {0286.32016}, url = {http://geodesic.mathdoc.fr/item/MZ_1975__142_172198/} }
Linda Keen. A Modular Group and Riemann Surfaces of Genus 2.. Mathematische Zeitschrift, Tome 142 (1975), pp. 205-220. http://geodesic.mathdoc.fr/item/MZ_1975__142_172198/