@article{DAN_1993_328_2_a2,
     author = {S. G. Merzlyakov},
     title = {On the closedness of the range of a difference operator},
     journal = {Doklady Akademii Nauk},
     pages = {141--142},
     publisher = {mathdoc},
     volume = {328},
     number = {2},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_328_2_a2/}
}