MathSciNet bibliographic data MR780081 (86k:11067) 11R32 (11E81) Serre, Jean-Pierre L'invariant de Witt de la forme ${\rm Tr}(x\sp 2)$${\rm Tr}(x\sp 2)$. (French) [The Witt invariant of the form ${\rm Tr}(x\sp 2)$${\rm Tr}(x\sp 2)$] Comment. Math. Helv. 59 (1984), no. 4, 651–676. Article

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