@article{IM2_2008_72_1_a4,
     author = {V. V. Nikulin},
     title = {On the connected components of moduli of real polarized {K3-surfaces}},
     journal = {Izvestiya. Mathematics },
     pages = {91--111},
     publisher = {mathdoc},
     volume = {72},
     number = {1},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2008_72_1_a4/}
}