@incollection{Leep2009Pytha-771, title={Pythagoras numbers and quadratic field extensions}, year={2009}, number={493}, isbn={978-0-8218-4648-3}, address={Providence, RI}, publisher={American Mathematical Society}, series={Contemporary Mathematics}, booktitle={Quadratic forms - algebra, arithmetic, and geometry : Algebraic and arithmetic theory of quadratic forms, December 13 - 19, 2007, Frutillar, Chile}, pages={21--29}, editor={Baeza, Ricardo}, author={Leep, David B. and Becher, Karim Johannes} }

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