@article{MZ_1919__3_167499,
     author = {W. SCHWAN},
     title = {Streckenrechnung und {Gruppentheorie}},
     journal = {Mathematische Zeitschrift},
     pages = {11--28},
     year = {1919},
     volume = {3},
     zbl = {47.0515.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__3_167499/}
}