@article{GDZPPN002297639, title = {Special Coordinate Coverings of Riemann Surfaces.}, journal = {Mathematische Annalen}, volume = {174}, year = {1967}, pages = {67-86}, zbl = {0144.33501}, url = {http://dml.mathdoc.fr/item/GDZPPN002297639} }
GUNNING, R.C. Special Coordinate Coverings of Riemann Surfaces.. Mathematische Annalen, Tome 174 (1967) pp. 67-86. http://gdmltest.u-ga.fr/item/GDZPPN002297639/