A purity theorem for the Witt group
Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 32 (1999) no. 1, pp. 71-86. 
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     title = {A purity theorem for the {Witt} group},
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Ojanguren, Manuel; Panin, Ivan. A purity theorem for the Witt group. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 32 (1999) no. 1, pp. 71-86. doi : 10.1016/s0012-9593(99)80009-3. http://www.numdam.org/articles/10.1016/s0012-9593(99)80009-3/

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