@article{JRAM_1985__358_152731,
     author = {Bernd Voigt},
     title = {Extensions of the {Graham-Leeb-Rothschild} theorem.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {209--220},
     publisher = {mathdoc},
     volume = {358},
     year = {1985},
     zbl = {0553.05011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1985__358_152731/}
}