@article{FAA_2000_34_4_a9,
     author = {A. Laptev},
     title = {The {Negative} {Spectrum} of a {Class} of {Two-Dimensional} {Schr\"odinger} {Operators} with {Potentials} {Depending} {Only} on {Radius}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {85--87},
     publisher = {mathdoc},
     volume = {34},
     number = {4},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2000_34_4_a9/}
}