Geodesic
Diameters of certain sets in function spaces
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 3 
Yu. I. Grigoryan. Diameters of certain sets in function spaces. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 3. http://geodesic.mathdoc.fr/item/RM_1975_30_3_a12/
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     title = {Diameters of certain sets in function spaces},
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     url = {http://geodesic.mathdoc.fr/item/RM_1975_30_3_a12/}
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[1] A. Kolmogoroff, “Über die beste Annäherung von Funktionen einer gegebenen Funktionenklasse”, Ann. of Math., 37 (1936), 107–110 | DOI | MR

[2] V. M. Tikhomirov, “Poperechniki mnozhestv v funktsionalnykh prostranstvakh i teoriya nailuchshikh priblizhenii”, UMN, 15:3 (1960), 81–120 | MR | Zbl

[3] Yu. I. Makovoz, Avtoreferat, Minsk, 1969 | Zbl