@article{05232994, title = {Geometric methods for cohomological invariants.}, journal = {Documenta Mathematica}, volume = {12}, year = {2007}, pages = {521-545}, zbl = {1137.14010}, language = {en}, url = {http://dml.mathdoc.fr/item/05232994} }
Guillot, Pierre. Geometric methods for cohomological invariants.. Documenta Mathematica, Tome 12 (2007) pp. 521-545. http://gdmltest.u-ga.fr/item/05232994/