@article{DAN_1960_131_6_a13,
     author = {\v{S}i \v{C}\v{z}un-cy},
     title = {Asymptotic behavior of the eigenfunctions of {Sturm--Liouville's} problem calculated by using perturbation theory},
     journal = {Doklady Akademii Nauk},
     pages = {1279--1282},
     publisher = {mathdoc},
     volume = {131},
     number = {6},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_131_6_a13/}
}