@article{MZM_1978_23_2_a10,
     author = {V. B. Korotkov},
     title = {A~criterion for unitary equivalence of unbounded operators to integral operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {271--280},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_2_a10/}
}