@article{CMH_1930__2_138546,
     author = {A. Speiser},
     title = {Ueber {Riemannsche} {Fl\"achen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {284--293},
     year = {1930},
     volume = {2},
     zbl = {56.0987.03},
     url = {http://geodesic.mathdoc.fr/item/CMH_1930__2_138546/}
}