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@article{CMH_1984__59_139995, author = {Jean-Pierre Serre}, title = {L'invariant de {Witt} de la forme {Tr(x2).}}, journal = {Commentarii mathematici Helvetici}, pages = {651--676}, publisher = {mathdoc}, volume = {59}, year = {1984}, zbl = {0565.12014}, url = {http://geodesic.mathdoc.fr/item/CMH_1984__59_139995/} }
Jean-Pierre Serre. L'invariant de Witt de la forme Tr(x2).. Commentarii mathematici Helvetici, Tome 59 (1984), pp. 651-676. http://geodesic.mathdoc.fr/item/CMH_1984__59_139995/