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@article{MZ_1973__131_171898, author = {Richard Elman and Tsit-Yuen Lam}, title = {Quadratic {Forms} and the {u-Invariant.} {I.}}, journal = {Mathematische Zeitschrift}, pages = {283--304}, publisher = {mathdoc}, volume = {131}, year = {1973}, zbl = {0244.10020}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__131_171898/} }
Richard Elman; Tsit-Yuen Lam. Quadratic Forms and the u-Invariant. I.. Mathematische Zeitschrift, Tome 131 (1973), pp. 283-304. http://geodesic.mathdoc.fr/item/MZ_1973__131_171898/