@article{CMH_1930__2_138534,
     author = {Arnold Emch},
     title = {Ueber eine besondere {Klasse} von algebraischen {Fl\"achen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {99--115},
     publisher = {mathdoc},
     volume = {2},
     year = {1930},
     zbl = {56.1173.03},
     url = {http://geodesic.mathdoc.fr/item/CMH_1930__2_138534/}
}