@article{JRAM_1920__150_149494,
     author = {E. Czuber},
     title = {Der {Mittelwert} eines {Quotienten.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {175--179},
     publisher = {mathdoc},
     volume = {150},
     year = {1920},
     zbl = {47.0957.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1920__150_149494/}
}