@article{DE_1983_19_12_a22,
     author = {O. A. Plaksina},
     title = {Condition for localization of the spectrum of a {Sturm--Liouville} boundary value problem on the positive half axis},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2177--2179},
     publisher = {mathdoc},
     volume = {19},
     number = {12},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_12_a22/}
}