@article{GDZPPN002298775, title = {Immersion of Open Riemann Surfaces.}, journal = {Mathematische Annalen}, volume = {174}, year = {1967}, pages = {103-108}, zbl = {0179.11402}, url = {http://dml.mathdoc.fr/item/GDZPPN002298775} }
NARASIMHAN, R.; GUNNING, R.C. Immersion of Open Riemann Surfaces.. Mathematische Annalen, Tome 174 (1967) pp. 103-108. http://gdmltest.u-ga.fr/item/GDZPPN002298775/