@article{DOCMA_1996__1__a18,
     author = {Karpenko, Nikita A.},
     title = {Order of torsion in $CH\sp 4$ of quadrics},
     journal = {Documenta mathematica},
     pages = {57--65},
     publisher = {mathdoc},
     volume = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1996__1__a18/}
}