@article{ELMA_1975__30_141157,
     author = {Eberhard Schr\"oder},
     title = {Untersuchungen zu einem hyperoskulierenden {B\"uschel} von {Kegelschnitten.}},
     journal = {Elemente der Mathematik},
     pages = {49--55},
     publisher = {mathdoc},
     volume = {30},
     year = {1975},
     zbl = {0306.53008},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1975__30_141157/}
}