@article{JRAM_1969__234_150896,
     author = {Joachim Ahrens and H. Wolff and A. Dre{\ss}},
     title = {Relationen zwischen {Symmetrien} in orthogonalen {Gruppen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--11},
     publisher = {mathdoc},
     volume = {234},
     year = {1969},
     zbl = {0218.15009},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1969__234_150896/}
}