Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1954__9_140611, author = {R. Sauer}, title = {Elementargeometrische {Modelle} zur {Differentialgeometrie.}}, journal = {Elemente der Mathematik}, pages = {121--131}, publisher = {mathdoc}, volume = {9}, year = {1954}, zbl = {0056.14803}, url = {http://geodesic.mathdoc.fr/item/ELMA_1954__9_140611/} }
R. Sauer. Elementargeometrische Modelle zur Differentialgeometrie.. Elemente der Mathematik, Tome 9 (1954), pp. 121-131. http://geodesic.mathdoc.fr/item/ELMA_1954__9_140611/