@article{MZ_1950__53_169165,
     author = {K. NICKEL},
     title = {L\"osung eines speziellen {Minimumproblems}},
     journal = {Mathematische Zeitschrift},
     pages = {21--52},
     year = {1950},
     volume = {53},
     zbl = {0040.34801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1950__53_169165/}
}