Quadratic Forms Under Algebraic Extensions.
Quadratic Forms and the ?-Invariant. II.
Classification Theorems for Quadratic Forms over Fields
Levels in algebra and topology.
Pfister Ideals in Witt Rings.
Sums of 2m-th powers of rational functions in one variable over real closed fields.
Function Fileds of Pfister Forms.
Even Symmetric Sextics.
Orderings under field extensions.
The Pythagoras number of some affine algebras and local algebras.
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