@article{ELMA_1973__28_141087,
     author = {E. Kreyszig and Alois Pendl},
     title = {\"Uber die {Gauss-Kr\"ummung} der {Real-} und {Imagin\"arteilfl\"achen} analytischer {Funktionen.}},
     journal = {Elemente der Mathematik},
     pages = {10--13},
     publisher = {mathdoc},
     volume = {28},
     year = {1973},
     zbl = {0261.53003},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1973__28_141087/}
}