@article{DE_1987_23_10_a11,
     author = {A. E. Evzhanov},
     title = {Inequalities of {Bessel,} {Hausdorff{\textendash}Young{\textendash}Riesz} and {Hilbert} type in a system of eigen- and associated functions of a second-order elliptic operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1751--1763},
     year = {1987},
     volume = {23},
     number = {10},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_10_a11/}
}