@article{GDZPPN002053020, title = {Die eindimensionalen Freigebilde.}, journal = {Commentarii mathematici Helvetici}, volume = {12}, year = {1939}, pages = {254-262}, zbl = {0023.16001}, url = {http://dml.mathdoc.fr/item/GDZPPN002053020} }
Finsler, Paul. Die eindimensionalen Freigebilde.. Commentarii mathematici Helvetici, Tome 12 (1939) pp. 254-262. http://gdmltest.u-ga.fr/item/GDZPPN002053020/