@article{DAN_1981_259_1_a8,
     author = {M. Otelbaev},
     title = {On asymptotic formulas for eigenvalues of the {Sturm{\textendash}Liouville} operator},
     journal = {Doklady Akademii Nauk},
     pages = {42--44},
     year = {1981},
     volume = {259},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_259_1_a8/}
}