%0 Journal Article %A K. V. Zainullin %T On Grothendieck's conjecture on principal homogeneous spaces for some classical algebraic groups %J Algebra i analiz %D 2000 %P 150-184 %V 12 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_2000_12_1_a4/ %G ru %F AA_2000_12_1_a4