@article{ELMA_1966__21_140828,
     author = {H. Schaal},
     title = {Ein {Beitrag} zur {Geometrie} \"ahnlich-ver\"anderlicher {Felder.}},
     journal = {Elemente der Mathematik},
     pages = {97--109},
     publisher = {mathdoc},
     volume = {21},
     year = {1966},
     zbl = {0145.17203},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1966__21_140828/}
}