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@article{CMH_1938__11_138717, author = {Paul Finsler}, title = {\"Uber {Freisysteme} (lineare {Freigebilde).}}, journal = {Commentarii mathematici Helvetici}, pages = {62--76}, publisher = {mathdoc}, volume = {11}, year = {1938}, zbl = {0019.32503}, url = {http://geodesic.mathdoc.fr/item/CMH_1938__11_138717/} }
Paul Finsler. Über Freisysteme (lineare Freigebilde).. Commentarii mathematici Helvetici, Tome 11 (1938), pp. 62-76. http://geodesic.mathdoc.fr/item/CMH_1938__11_138717/