@article{MZ_1919__4_167529,
     author = {H., Liebmann},
     title = {Das {Frobeniussche} {Kappendreieck} und die isoperimetrische {Eigenschaft} des {Kreises}},
     journal = {Mathematische Zeitschrift},
     pages = {288--294},
     publisher = {mathdoc},
     volume = {4},
     year = {1919},
     zbl = {47.0681.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__4_167529/}
}