@article{MZM_2005_78_1_a7,
     author = {Kh. K. Ishkin},
     title = {Necessary {Conditions} for the {Localization} of the {Spectrum} of the {Sturm--Liouville} {Problem} on a {Curve}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {72--84},
     publisher = {mathdoc},
     volume = {78},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_78_1_a7/}
}