@article{DAN_1957_114_1_a3,
     author = {S. N. Levina},
     title = {On the solution of the oscillation equation over the entire time axis},
     journal = {Doklady Akademii Nauk},
     pages = {18--20},
     publisher = {mathdoc},
     volume = {114},
     number = {1},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_114_1_a3/}
}