Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MZ_1919__3_167504, author = {P. Funk}, title = {\"Uber den {Begriff} extremale {Kr\"ummung}}, journal = {Mathematische Zeitschrift}, pages = {87--92}, publisher = {mathdoc}, volume = {3}, year = {1919}, zbl = {47.0478.01}, url = {http://geodesic.mathdoc.fr/item/MZ_1919__3_167504/} }
P. Funk. Über den Begriff extremale Krümmung. Mathematische Zeitschrift, Tome 3 (1919), pp. 87-92. http://geodesic.mathdoc.fr/item/MZ_1919__3_167504/