@article{10_4153_CMB_1958_006_4,
     author = {Zassenhaus, Hans},
     title = {On a {Normal} {Form} of the {Orthogonal} {Transformation} {I}},
     journal = {Canadian mathematical bulletin},
     pages = {31--39},
     year = {1958},
     volume = {1},
     number = {1},
     doi = {10.4153/CMB-1958-006-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1958-006-4/}
}