@article{ELMA_1951__6_140571,
     author = {Fritz Hohenberg},
     title = {Die {Brennpunktseigenschaften} der {Kegelschnitte} im komplexen {Gebiet.}},
     journal = {Elemente der Mathematik},
     pages = {121--129},
     publisher = {mathdoc},
     volume = {6},
     year = {1951},
     zbl = {0043.35901},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1951__6_140571/}
}