@article{MAN_1967__174_161628,
     author = {R. NARASIMHAN and R.C. GUNNING},
     title = {Immersion of {Open} {Riemann} {Surfaces.}},
     journal = {Mathematische Annalen},
     pages = {103--108},
     publisher = {mathdoc},
     volume = {174},
     year = {1967},
     zbl = {0179.11402},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__174_161628/}
}