@article{DAN_1992_323_3_a1,
     author = {A. G. Baskakov},
     title = {On the splitting of a differential operator with unbounded},
     journal = {Doklady Akademii Nauk},
     pages = {380--384},
     year = {1992},
     volume = {323},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_3_a1/}
}