Geodesic
The equivariant cohomology groups of a real algebraic surface and their applications
Izvestiya. Mathematics, Tome 60 (1996) no. 6, pp. 1193-1217 Cet article a éte moissonné depuis la source Math-Net.Ru

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Exact sequences connecting the equivariant cohomology groups of a real algebraic surface are constructed, and sufficient conditions for the convergence of the second spectral sequence are established. The results obtained are applied to the study of the topology of a surface and to the determination of the Brauer group. 
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V. A. Krasnov. The equivariant cohomology groups of a real algebraic surface and their applications. Izvestiya. Mathematics, Tome 60 (1996) no. 6, pp. 1193-1217. http://geodesic.mathdoc.fr/item/IM2_1996_60_6_a3/

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