@article{CMH_1929__1_138517,
     author = {Willy Scherrer},
     title = {Zur {Theorie} der endlichen {Gruppen} topologischer {Abbildungen} von geschlossenen {Fl\"achen} in sich.},
     journal = {Commentarii mathematici Helvetici},
     pages = {69--119},
     publisher = {mathdoc},
     volume = {1},
     year = {1929},
     zbl = {55.0312.01},
     url = {http://geodesic.mathdoc.fr/item/CMH_1929__1_138517/}
}