@article{JRAM_1915__145_149432,
     author = {Leon Lichtenstein},
     title = {\"Uber einige {Existenzprobleme} der {Variationsrechnung.} {Methode} der unendlich vielen {Variablen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {24--85},
     publisher = {mathdoc},
     volume = {145},
     year = {1915},
     zbl = {45.0611.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1915__145_149432/}
}