@article{JRAM_1940__182_150083,
     author = {Eugen Egerv\'ary},
     title = {\"Uber ein r\"aumliches {Analogon} des {Sehnenvierecks.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {122--128},
     publisher = {mathdoc},
     volume = {182},
     year = {1940},
     zbl = {0023.15701},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1940__182_150083/}
}