@article{DAN_1964_157_5_a10,
     author = {V. Ya. Stetsenko},
     title = {An estimate for the spectrum of some classes of linear operators},
     journal = {Doklady Akademii Nauk},
     pages = {1054--1057},
     publisher = {mathdoc},
     volume = {157},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_157_5_a10/}
}