@article{DAN_1978_243_5_a4,
     author = {V. A. Il'in and I. Jo},
     title = {A uniform bound on the eigenfunctions and an upper bound on the number of eigenvalues of the {Sturm{\textendash}Liouville} operator},
     journal = {Doklady Akademii Nauk},
     pages = {1113--1115},
     year = {1978},
     volume = {243},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_243_5_a4/}
}