Geodesic
Plane sets that are Chebyshev in some norm
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2021), pp. 35-39

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We describe plane sets, each of which is Chebyshev in some norm. 
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     author = {K. S. Shklyaev},
     title = {Plane sets that are {Chebyshev} in some norm},
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K. S. Shklyaev. Plane sets that are Chebyshev in some norm. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2021), pp. 35-39. http://geodesic.mathdoc.fr/item/VMUMM_2021_2_a6/