@article{GDZPPN002318245,
title = {Pfister Ideals in Witt Rings.},
journal = {Mathematische Annalen},
volume = {243},
year = {1979},
pages = {219-246},
zbl = {0401.10032},
url = {http://dml.mathdoc.fr/item/GDZPPN002318245}
}
Lam, T.Y.; Elman, R.; Wadsworth, A.R. Pfister Ideals in Witt Rings.. Mathematische Annalen, Tome 243 (1979) pp. 219-246. http://gdmltest.u-ga.fr/item/GDZPPN002318245/