@article{MZM_2004_76_2_a4,
     author = {V. A. Krasnov},
     title = {The {Nikulin} {Congruence} for {Four-Dimensional} $M${-Varieties}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {205--215},
     publisher = {mathdoc},
     volume = {76},
     number = {2},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2004_76_2_a4/}
}