@article{MAN_1939__116_160018,
     author = {C.F. Y\"u},
     title = {On the vertices of an oval},
     journal = {Mathematische Annalen},
     pages = {571--573},
     year = {1939},
     volume = {116},
     zbl = {65.0825.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1939__116_160018/}
}