@article{MAN_1903__57_158085,
     author = {Oskar Bolza},
     title = {Zur zweiten {Variation} bei isoperimetrischen {Problemen}},
     journal = {Mathematische Annalen},
     pages = {44--47},
     publisher = {mathdoc},
     volume = {57},
     year = {1903},
     url = {http://geodesic.mathdoc.fr/item/MAN_1903__57_158085/}
}