@article{JRAM_1928__159_149662,
     author = {Ludwig von D\'avid},
     title = {Arithmetisch-geometrisches {Mittel} und {Modulfunktion.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {154--170},
     publisher = {mathdoc},
     volume = {159},
     year = {1928},
     zbl = {54.0404.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1928__159_149662/}
}