@article{ELMA_1969__24_140917,
     author = {Erwin Kreyszig},
     title = {Die {Realteil-} und {Imagin\"arteilfl\"achen} analytischer {Funktionen.}},
     journal = {Elemente der Mathematik},
     pages = {25--31},
     publisher = {mathdoc},
     volume = {24},
     year = {1969},
     zbl = {0169.23603},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140917/}
}