@article{MZ_1929__30_168143,
     author = {E. Landau},
     title = {\"Uber schlichte {Funktionen}},
     journal = {Mathematische Zeitschrift},
     pages = {635--638},
     year = {1929},
     volume = {30},
     zbl = {55.0187.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__30_168143/}
}