@article{ELMA_1970__25_140978,
     author = {E. Heil},
     title = {Affine {Scheitel} von {Ovalen.}},
     journal = {Elemente der Mathematik},
     pages = {84--85},
     publisher = {mathdoc},
     volume = {25},
     year = {1970},
     zbl = {0175.48201},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1970__25_140978/}
}