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

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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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     author = {V. A. Krasnov},
     title = {The {Nikulin} {Congruence} for {Four-Dimensional} $M${-Varieties}},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
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     number = {2},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_2_a4/}
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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/