@article{MZ_1919__4_167527,
     author = {O., Perron},
     title = {\"Uber eine spezielle {Klasse} von {Regelfi\"achen}},
     journal = {Mathematische Zeitschrift},
     pages = {231--270},
     publisher = {mathdoc},
     volume = {4},
     year = {1919},
     zbl = {47.0660.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__4_167527/}
}