Geodesic
Picard and Lefschetz numbers of real algebraic surfaces
Matematičeskie zametki, Tome 63 (1998) no. 6, pp. 847-852.

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Two Picard numbers and two Lefschetz numbers are defined for a real algebraic surface. They are similar to the Picard number and the Lefschetz number of a complex algebraic surface. For these numbers, some estimates and relations in the form of inequalities are proved. 
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V. A. Krasnov. Picard and Lefschetz numbers of real algebraic surfaces. Matematičeskie zametki, Tome 63 (1998) no. 6, pp. 847-852. http://geodesic.mathdoc.fr/item/MZM_1998_63_6_a4/

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