@article{DE_1993_29_10_a16,
     author = {Sh. A. Alimov and S. A. Safaev},
     title = {On the number of negative eigenvalues of the {Schr\"odinger} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1818--1821},
     publisher = {mathdoc},
     volume = {29},
     number = {10},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_10_a16/}
}