@article{MZM_2002_71_1_a5,
     author = {M. I. Graev},
     title = {Relatively {Closed} {Operators} {Associated} to a {Pair} of {Grassmannians}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {61--74},
     publisher = {mathdoc},
     volume = {71},
     number = {1},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2002_71_1_a5/}
}