@article{DE_1992_28_9_a15,
     author = {I. M. Novitskii},
     title = {Unitary equivalence between linear operators and integral operators with smooth kernels},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1608--1616},
     publisher = {mathdoc},
     volume = {28},
     number = {9},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_9_a15/}
}