@article{DAN_1970_195_6_a3,
     author = {V. B. Korotkov},
     title = {On integral operators},
     journal = {Doklady Akademii Nauk},
     pages = {1267--1269},
     publisher = {mathdoc},
     volume = {195},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_195_6_a3/}
}