Geodesic
Exact Jackson-Stechkin inequalities and diameters of classes of functions from $L_2(R^2,e^{-x^2-y^2})$
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (2007), pp. 3-9 
M. G. Esmaganbetov. Exact Jackson-Stechkin inequalities and diameters of classes of functions from $L_2(R^2,e^{-x^2-y^2})$. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (2007), pp. 3-9. http://geodesic.mathdoc.fr/item/IVM_2007_2_a0/
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