%0 Journal Article %A Nikita A. Karpenko %T Order of torsion in CH⁴ of quadrics %J Documenta mathematica %D 1996 %P 57-65 %V 1 %U http://geodesic.mathdoc.fr/articles/10.4171/dm/2/ %R 10.4171/dm/2 %F 10_4171_dm_2