@article{MZ_1953__58_169339,
     author = {Otto F\"ollinger},
     title = {Ebene {Variationsprobleme} mit freien {Endpunkten.}},
     journal = {Mathematische Zeitschrift},
     pages = {98--112},
     publisher = {mathdoc},
     volume = {58},
     year = {1953},
     zbl = {0050.32601},
     url = {http://geodesic.mathdoc.fr/item/MZ_1953__58_169339/}
}