@article{MZM_1968_4_2_a7,
     author = {Yu. N. Sudarev},
     title = {Some asymptotic spectral properties of singular operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {169--172},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_2_a7/}
}