Geodesic
On degrees of approximation of some classes by polynomials with respect to generalized Haar system
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 3 (2006), pp. 92-105.

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A generalized anysotropic Lorentz space is considered. A sufficient condition of embedding the class $H_{\varphi,\theta}^r$ into the Lorentz space is formulated; and the degree of approximation of this class sums by polynomials with respect to the generalized Haar system is determined. 
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G. A. Akishev. On degrees of approximation of some classes by polynomials with respect to generalized Haar system. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 3 (2006), pp. 92-105. http://geodesic.mathdoc.fr/item/SEMR_2006_3_a3/

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