@article{ZNSL_1998_252_a8,
     author = {S. E. Kozlov},
     title = {Geometry of real {Grassmanian} {manifolds.~IV}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {78--103},
     publisher = {mathdoc},
     volume = {252},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1998_252_a8/}
}