Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1952__56_169284, author = {Frank L\"obell}, title = {Nat\"urliche {Geometrie} der {Kurvenkongruenzen.}}, journal = {Mathematische Zeitschrift}, pages = {208--218}, publisher = {mathdoc}, volume = {56}, year = {1952}, language = {de}, url = {http://geodesic.mathdoc.fr/item/MZ_1952__56_169284/} }
Frank Löbell. Natürliche Geometrie der Kurvenkongruenzen.. Mathematische Zeitschrift, Tome 56 (1952), pp. 208-218. http://geodesic.mathdoc.fr/item/MZ_1952__56_169284/