@article{MZM_1998_63_6_a4,
     author = {V. A. Krasnov},
     title = {Picard and {Lefschetz} numbers of real algebraic surfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {847--852},
     publisher = {mathdoc},
     volume = {63},
     number = {6},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_63_6_a4/}
}