@article{MZM_1976_20_3_a4,
     author = {L. B. Zelenko},
     title = {Asymptotic distribution of eigenvalues in a~lacuna of the continuous spectrum of the perturbed {Hill} operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {341--350},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_3_a4/}
}