@article{DAN_1977_234_1_a3,
     author = {B. M. Levitan},
     title = {On the solvability of the inverse {Sturm--Liouville} problem on the entire line},
     journal = {Doklady Akademii Nauk},
     pages = {22--25},
     publisher = {mathdoc},
     volume = {234},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_234_1_a3/}
}