%0 Journal Article %A V. I. Yanchevskii %T K-unirationality of conic bundles, the Kneser-Tits conjecture for spinor groups and central simple algebras %J Banach Center Publications %D 1990 %P 483-490 %V 26 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/-26-2-483-490/ %R 10.4064/-26-2-483-490 %G en %F 10_4064__26_2_483_490