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@article{IM_1973__21_142222, author = {Richard Elman and T.Y. Lam}, title = {Quadratic {Forms} and the {?-Invariant.} {II.}}, journal = {Inventiones mathematicae}, pages = {125--138}, publisher = {mathdoc}, volume = {21}, year = {1973}, zbl = {0267.10029}, url = {http://geodesic.mathdoc.fr/item/IM_1973__21_142222/} }
Richard Elman; T.Y. Lam. Quadratic Forms and the ?-Invariant. II.. Inventiones mathematicae, Tome 21 (1973), pp. 125-138. http://geodesic.mathdoc.fr/item/IM_1973__21_142222/