@article{MZ_1940__46_168894,
     author = {E., Lammel},
     title = {\"Uber {Approximation} regul\"arer {Funktionen} eines komplexen {Argumentes} durch rationale {Funktionen}},
     journal = {Mathematische Zeitschrift},
     pages = {104--116},
     publisher = {mathdoc},
     volume = {46},
     year = {1940},
     zbl = {0023.05201},
     url = {http://geodesic.mathdoc.fr/item/MZ_1940__46_168894/}
}