Geodesic
The Gelfand and Bernstein $n$-widths of some classes of analytic functions
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 22, Tome 217 (1994), pp. 112-129

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Generalizations of a well-known theorem of Ismagilov on Kolmogorov $n$-widths on Hilbert space are considered for Gelfand and Bernstein $n$-widths. Some examples are given. Bibliography: 10 titles. 
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     author = {O. G. Parfenov},
     title = {The {Gelfand} and {Bernstein} $n$-widths of some classes of analytic functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {112--129},
     publisher = {mathdoc},
     volume = {217},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1994_217_a9/}
}
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O. G. Parfenov. The Gelfand and Bernstein $n$-widths of some classes of analytic functions. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 22, Tome 217 (1994), pp. 112-129. http://geodesic.mathdoc.fr/item/ZNSL_1994_217_a9/