@article{MZ_1968__104_170928,
     author = {Hans-J\"org Reifen},
     title = {Analytische {Kegelmengen.}},
     journal = {Mathematische Zeitschrift},
     pages = {50--58},
     publisher = {mathdoc},
     volume = {104},
     year = {1968},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__104_170928/}
}