@article{DE_1997_33_6_a18,
     author = {V. V. Dubrovskii},
     title = {On an inequality in inverse problems of spectral analysis},
     journal = {Differencialʹnye uravneni\^a},
     pages = {843--844},
     publisher = {mathdoc},
     volume = {33},
     number = {6},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_6_a18/}
}