@article{DAN_1964_157_2_a2,
     author = {A. R. Esayan and V. Ya. Stetsenko},
     title = {Estimates of the spectrum of integral operators and infinite matrices},
     journal = {Doklady Akademii Nauk},
     pages = {254--257},
     publisher = {mathdoc},
     volume = {157},
     number = {2},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_157_2_a2/}
}