@article{JRAM_1942__184_150115,
     author = {Heinrich W.E. Jung},
     title = {Rationale und halbrationale {Doppelebenen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {199--237},
     publisher = {mathdoc},
     volume = {184},
     year = {1942},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1942__184_150115/}
}