@article{DAN_1989_308_1_a3,
     author = {V. M. Gorbachuk},
     title = {Behavior at infinity of solutions of operator-differential},
     journal = {Doklady Akademii Nauk},
     pages = {23--27},
     publisher = {mathdoc},
     volume = {308},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_308_1_a3/}
}