@article{MAN_1973__204_162471,
     author = {Klaus Hoppe},
     title = {Kugeldarstellungen der orthogonalen {Gruppe.}},
     journal = {Mathematische Annalen},
     pages = {227--238},
     publisher = {mathdoc},
     volume = {204},
     year = {1973},
     zbl = {0241.22027},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__204_162471/}
}