@article{MZ_1954__60_169427,
     author = {Otto F\"ollinger},
     title = {Kontinuierliche {L\"osungen} von {Variationsproblemen} mit {Gef\"allebeschr\"ankung.}},
     journal = {Mathematische Zeitschrift},
     pages = {243--254},
     publisher = {mathdoc},
     volume = {60},
     year = {1954},
     zbl = {0057.08901},
     url = {http://geodesic.mathdoc.fr/item/MZ_1954__60_169427/}
}