@article{MAN_1903__57_158094,
     author = {Erhard Schmidt},
     title = {\"Uber die {Anzahl} der {Primzahlen} unter gegebener {Grenze}},
     journal = {Mathematische Annalen},
     pages = {195--204},
     publisher = {mathdoc},
     volume = {57},
     year = {1903},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1903__57_158094/}
}