@article{DAN_1989_304_4_a5,
     author = {D. L. Kudryavtsev},
     title = {Asymptotic behavior of solutions of a second-order linear},
     journal = {Doklady Akademii Nauk},
     pages = {796--799},
     publisher = {mathdoc},
     volume = {304},
     number = {4},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_304_4_a5/}
}