On Jackson theorems for the generalized modulus of smoothness
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations on the theory of functions of several real variables and approximation of functons, Tome 172 (1985), pp. 291-298.

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@article{TM_1985_172_a20,
     author = {M. K. Potapov and V. M. Fedorov},
     title = {On {Jackson} theorems for the generalized modulus of smoothness},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {291--298},
     publisher = {mathdoc},
     volume = {172},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1985_172_a20/}
}
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M. K. Potapov; V. M. Fedorov. On Jackson theorems for the generalized modulus of smoothness. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Investigations on the theory of functions of several real variables and approximation of functons, Tome 172 (1985), pp. 291-298. http://geodesic.mathdoc.fr/item/TM_1985_172_a20/