@article{MZ_1920__6_167575,
     author = {W., Blaschke},
     title = {Geometrische {Untersuchungen} zur {Variationsrechnung.} {I.} {\"Uber} {Symmetralen}},
     journal = {Mathematische Zeitschrift},
     pages = {281--285},
     publisher = {mathdoc},
     volume = {6},
     year = {1920},
     zbl = {47.0479.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1920__6_167575/}
}