Geodesic
Constructive description of certain classes of functions on quasismooth arcs
Izvestiya. Mathematics , Tome 44 (1995) no. 1, pp. 193-206.

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Three classes of functions are introduced, corresponding to known results in the theory of uniform polynomial approximation of functions on arcs in the complex plane. The structural properties of functions in these classes are described from a unified point of view, which allows one to understand more fully their nature and the differences between them. 
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V. V. Andrievskii; V. V. Maimeskul. Constructive description of certain classes of functions on quasismooth arcs. Izvestiya. Mathematics , Tome 44 (1995) no. 1, pp. 193-206. http://geodesic.mathdoc.fr/item/IM2_1995_44_1_a9/

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