@article{DE_1998_34_5_a5,
     author = {V. A. Il'in},
     title = {An estimate for the spectral function of a selfadjoint extension in $\mathbb R^2$ of the {Schr\"odinger} operator with a potential satisfying the {Stummel} condition},
     journal = {Differencialʹnye uravneni\^a},
     pages = {638--646},
     publisher = {mathdoc},
     volume = {34},
     number = {5},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_5_a5/}
}