@article{01680953, title = {Realizing countable groups as automorphism groups of Riemann surfaces.}, journal = {Documenta Mathematica}, volume = {6}, year = {2001}, pages = {413-417}, zbl = {0989.30030}, language = {en}, url = {http://dml.mathdoc.fr/item/01680953} }
Winkelmann, Jörg. Realizing countable groups as automorphism groups of Riemann surfaces.. Documenta Mathematica, Tome 6 (2001) pp. 413-417. http://gdmltest.u-ga.fr/item/01680953/