@article{JRAM_1974__267_151433,
     author = {Hansjoachim Groh},
     title = {Ovals and non-ovoidal {Laguerre} planes.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {50--66},
     publisher = {mathdoc},
     volume = {267},
     year = {1974},
     zbl = {0281.50012},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1974__267_151433/}
}