@article{DE_1965_1_8_a5,
     author = {D. F. Kharazov},
     title = {The estimates of eigenvalues of certain operators with a discrete spectrum},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1054--1069},
     publisher = {mathdoc},
     volume = {1},
     number = {8},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_8_a5/}
}