@article{DE_1981_17_11_a5,
     author = {N. La\v{z}eti\'c},
     title = {Uniform estimates for derivatives of eigenfunctions of a selfadjoint {Sturm--Liouville} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1978--1983},
     publisher = {mathdoc},
     volume = {17},
     number = {11},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_11_a5/}
}