Geodesic
Cohomological Witt rings
Izvestiya. Mathematics , Tome 2 (1968) no. 5, pp. 1101-1115.

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The class of profinite groups is adduced, for whose Witt rings we construct a cohomological analog of Pfister's theory of quadratic forms. 
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A. A. Bel'skii. Cohomological Witt rings. Izvestiya. Mathematics , Tome 2 (1968) no. 5, pp. 1101-1115. http://geodesic.mathdoc.fr/item/IM2_1968_2_5_a9/

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