Geodesic
The Nikulin Congruence for Four-Dimensional $M$-Varieties
Matematičeskie zametki, Tome 76 (2004) no. 2, pp. 205-215.

Voir la notice de l'article provenant de la source Math-Net.Ru

For real four-dimensional algebraic $M$-varieties, a congruence for the Euler characteristic of the real locus, which is an analog of the Nikulin congruence of the Euler characteristic of an $M$-surface, is proved. 
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V. A. Krasnov. The Nikulin Congruence for Four-Dimensional $M$-Varieties. Matematičeskie zametki, Tome 76 (2004) no. 2, pp. 205-215. http://geodesic.mathdoc.fr/item/MZM_2004_76_2_a4/

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