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@article{JRAM_1990__404_153206, author = {David B. Leep}, title = {Pfister's conjecture on quadratic {Co-fields.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {209--220}, publisher = {mathdoc}, volume = {404}, year = {1990}, zbl = {0685.10014}, url = {http://geodesic.mathdoc.fr/item/JRAM_1990__404_153206/} }
David B. Leep. Pfister's conjecture on quadratic Co-fields.. Journal für die reine und angewandte Mathematik, Tome 404 (1990), pp. 209-220. http://geodesic.mathdoc.fr/item/JRAM_1990__404_153206/