Geodesic
Gel'fand widths of certain classes of analytic functions
Sbornik. Mathematics, Tome 82 (1995) no. 1, pp. 223-229

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A formula, generalizing certain earlier known formulas of the same type, is obtained for the $n$th Gel'fand width of the imbedding operator $$ J\colon X^2(G)\to L_\infty(E), $$ where $G$ is a domain in $\mathbb{C}^m$ and $X^2(G)$ is some Hilbert space of analytic functions in $G$ with a reproducing kernel. 
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     author = {O. G. Parfenov},
     title = {Gel'fand widths of certain classes of analytic functions},
     journal = {Sbornik. Mathematics},
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     number = {1},
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     url = {http://geodesic.mathdoc.fr/item/SM_1995_82_1_a10/}
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O. G. Parfenov. Gel'fand widths of certain classes of analytic functions. Sbornik. Mathematics, Tome 82 (1995) no. 1, pp. 223-229. http://geodesic.mathdoc.fr/item/SM_1995_82_1_a10/