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@article{ELMA_1955__10_140616, author = {R. Sauer}, title = {Elementargeometrische {Modelle} zur {Differentialgeometrie.} {(Schluss).}}, journal = {Elemente der Mathematik}, pages = {25--32}, publisher = {mathdoc}, volume = {10}, year = {1955}, zbl = {0064.40702}, url = {http://geodesic.mathdoc.fr/item/ELMA_1955__10_140616/} }
R. Sauer. Elementargeometrische Modelle zur Differentialgeometrie. (Schluss).. Elemente der Mathematik, Tome 10 (1955), pp. 25-32. http://geodesic.mathdoc.fr/item/ELMA_1955__10_140616/