Geodesic
On the $s$-numbers of integral operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 22 (1967) no. 2 
P. E. Sobolevskii. On the $s$-numbers of integral operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 22 (1967) no. 2. http://geodesic.mathdoc.fr/item/RM_1967_22_2_a14/
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     author = {P. E. Sobolevskii},
     title = {On the $s$-numbers of integral operators},
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     year = {1967},
     volume = {22},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1967_22_2_a14/}
}
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[1] I. Ts. Gokhberg, M. G. Krein, Vvedenie v teoriyu nesamosopryazhennykh operatorov, «Nauka», M., 1966

[2] M. Sh. Birman, M. Z. Solomyak, “O priblizhenii funktsii klassov $W_p^\alpha$ kusochno-polinomialnymi funktsiyami”, DAN, 1967

[3] S. G. Krein, “Ob odnoi interpolyatsionnoi teoreme v teorii operatorov”, DAN, 130:3 (1960) | MR | Zbl