@article{DAN_1994_336_4_a7,
     author = {V. D. Stepanov},
     title = {On the singular numbers of a~class of integral operators},
     journal = {Doklady Akademii Nauk},
     pages = {457--458},
     publisher = {mathdoc},
     volume = {336},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_336_4_a7/}
}