@article{MZM_2011_90_1_a13,
     author = {N. I. Goloschapova and V. P. Zastavnyi and M. M. Malamud},
     title = {Positive {Definite} {Functions} and {Spectral} {Properties} of the {Schr\"odinger} {Operator} with {Point} {Interactions}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {151--156},
     publisher = {mathdoc},
     volume = {90},
     number = {1},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_90_1_a13/}
}