@article{00897858, title = {Twisted Pfister forms.}, journal = {Documenta Mathematica}, volume = {1}, year = {1996}, pages = {67-102}, zbl = {0853.11027}, language = {en}, url = {http://dml.mathdoc.fr/item/00897858} }
Hoffmann, Detlev W. Twisted Pfister forms.. Documenta Mathematica, Tome 1 (1996) pp. 67-102. http://gdmltest.u-ga.fr/item/00897858/