@article{FAA_1994_28_4_a9,
     author = {V. A. Mikhailets},
     title = {A {Discreteness} {Criterion} for the {Spectrum} of a {One-Dimensional} {Schr\"odinger} {Operator} with $\delta${-Interactions}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {85--87},
     publisher = {mathdoc},
     volume = {28},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1994_28_4_a9/}
}