@article{CMH_1930__2_138540,
     author = {W. Michel},
     title = {Ueber die durch ...(z) = ........ definierte analytische {Funktion} f(z).},
     journal = {Commentarii mathematici Helvetici},
     pages = {191--216},
     publisher = {mathdoc},
     volume = {2},
     year = {1930},
     zbl = {56.0992.01},
     url = {http://geodesic.mathdoc.fr/item/CMH_1930__2_138540/}
}