@article{MZM_1975_18_6_a4,
     author = {N. E. Firsova},
     title = {An inverse scattering problem for a~perturbed {Hill's} operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {831--843},
     publisher = {mathdoc},
     volume = {18},
     number = {6},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_6_a4/}
}