@article{JRAM_1976__281_151684,
     author = {Erich W. Ellers},
     title = {The length of a unitary transformation for characteristic 2.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {6--12},
     year = {1976},
     volume = {281},
     zbl = {0324.20055},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__281_151684/}
}