@article{MZ_1964__83_170225,
     author = {Wolfgang Jenne},
     title = {Eine nat\"urliche {Affingeometrie} der {Strahlfl\"achen.}},
     journal = {Mathematische Zeitschrift},
     pages = {214--237},
     publisher = {mathdoc},
     volume = {83},
     year = {1964},
     zbl = {0178.24402},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__83_170225/}
}