@article{GDZPPN002381729, title = {L\"osung eines speziellen Minimumproblems}, journal = {Mathematische Zeitschrift}, volume = {52}, year = {1950}, pages = {21-52}, zbl = {0040.34801}, url = {http://dml.mathdoc.fr/item/GDZPPN002381729} }
NICKEL, K. Lösung eines speziellen Minimumproblems. Mathematische Zeitschrift, Tome 52 (1950) pp. 21-52. http://gdmltest.u-ga.fr/item/GDZPPN002381729/