@article{CMH_1936__9_138678,
     author = {Paul Finsler},
     title = {\"Uber eine {Klasse} algebraischer {Gebilde} {(Freigebilde).}},
     journal = {Commentarii mathematici Helvetici},
     pages = {172--187},
     publisher = {mathdoc},
     volume = {9},
     year = {1936},
     zbl = {0016.22101},
     url = {http://geodesic.mathdoc.fr/item/CMH_1936__9_138678/}
}