@article{GDZPPN002435160, title = {Higher Level Reduced Witt Rings of Skew Fields.}, journal = {Mathematische Zeitschrift}, volume = {199}, year = {1988}, pages = {545-554}, zbl = {0627.10014}, url = {http://dml.mathdoc.fr/item/GDZPPN002435160} }
Powers, Victoria. Higher Level Reduced Witt Rings of Skew Fields.. Mathematische Zeitschrift, Tome 199 (1988) pp. 545-554. http://gdmltest.u-ga.fr/item/GDZPPN002435160/