@article{JRAM_1886__99_148624,
     author = {S. Gundelfinger},
     title = {Zur {Theorie} der orthogonalen {Substitutionen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {147--153},
     publisher = {mathdoc},
     volume = {99},
     year = {1886},
     zbl = {17.0676.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1886__99_148624/}
}