@article{MZM_1967_1_5_a12,
     author = {B. M. Levitan and A. G. Ramm},
     title = {The asymptotic behavior of eigenvalues for the case when the potential depends on the parameter},
     journal = {Matemati\v{c}eskie zametki},
     pages = {595--604},
     publisher = {mathdoc},
     volume = {1},
     number = {5},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_5_a12/}
}