Geodesic
The Brauer and Witt Groups of Real Ruled Surfaces
Matematičeskie zametki, Tome 72 (2002) no. 5, pp. 706-714 
V. A. Krasnov. The Brauer and Witt Groups of Real Ruled Surfaces. Matematičeskie zametki, Tome 72 (2002) no. 5, pp. 706-714. http://geodesic.mathdoc.fr/item/MZM_2002_72_5_a8/
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     title = {The {Brauer} and {Witt} {Groups} of {Real} {Ruled} {Surfaces}},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The Brauer group and the Witt group of a real irrational ruled surface are determined by using equivariant cohomology.

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