%0 Journal Article %A Kowalski, Oldřich %T Orbits of transformation groups on certain Grassmann manifolds %J Czechoslovak Mathematical Journal %D 1968 %P 144-177 %V 18 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100818/ %R 10.21136/CMJ.1968.100818 %G en %F 10_21136_CMJ_1968_100818