@article{DM_1999_11_1_a2,
     author = {A. A. Grusho},
     title = {On the existence of hidden channels},
     journal = {Diskretnaya Matematika},
     pages = {24--28},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1999_11_1_a2/}
}