@article{GDZPPN00205096X,
title = {Ueber Riemannsche Fl\"achen.},
journal = {Commentarii mathematici Helvetici},
volume = {2},
year = {1930},
pages = {284-293},
zbl = {56.0987.03},
url = {http://dml.mathdoc.fr/item/GDZPPN00205096X}
}
Speiser, A. Ueber Riemannsche Flächen.. Commentarii mathematici Helvetici, Tome 2 (1930) pp. 284-293. http://gdmltest.u-ga.fr/item/GDZPPN00205096X/