Geodesic
Kolmogorov widths of weighted Sobolev classes with “small” singularity sets
Eurasian mathematical journal, Tome 10 (2019) no. 1, pp. 89-92.

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Sharp order estimates are stated for the Kolmogorov widths of weighted Sobolev classes on $h$-sets foe sertain limiting cases of the parameters. 
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A. A. Vasil'eva. Kolmogorov widths of weighted Sobolev classes with “small” singularity sets. Eurasian mathematical journal, Tome 10 (2019) no. 1, pp. 89-92. http://geodesic.mathdoc.fr/item/EMJ_2019_10_1_a7/

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