@article{RM_1977_32_1_a1,
     author = {M. Sh. Birman and M. Z. Solomyak},
     title = {Estimates of singular numbers of integral operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {15--89},
     publisher = {mathdoc},
     volume = {32},
     number = {1},
     year = {1977},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1977_32_1_a1/}
}