@article{ELMA_1969__24_140930,
     author = {K. Fladt},
     title = {Zur {M\"obiusinvolution} der {Ebene.}},
     journal = {Elemente der Mathematik},
     pages = {62--63},
     publisher = {mathdoc},
     volume = {24},
     year = {1969},
     zbl = {0175.18205},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140930/}
}