@article{DE_1979_15_7_a1,
     author = {V. A. Il'in and I. Jo},
     title = {Uniform estimation of eigenfunctions and an upper bound on the number of eigenvalues of the {Sturm{\textendash}Liouville} operator with a potential from the class $L^p$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1164--1174},
     year = {1979},
     volume = {15},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_7_a1/}
}