%0 Journal Article %A E. L. Bashkirov %T The group $\mathrm{Spin}_8$ and some subgroups of the unitary group of degree four over a~quaternion algebra %J Algebra i analiz %D 2001 %P 43-64 %V 13 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_2001_13_3_a2/ %G ru %F AA_2001_13_3_a2