@article{MZ_1929__30_168117,
     author = {E. Landau},
     title = {\"Uber einen {Valironschen} {Satz}},
     journal = {Mathematische Zeitschrift},
     pages = {205--207},
     publisher = {mathdoc},
     volume = {30},
     year = {1929},
     zbl = {55.0188.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__30_168117/}
}