Geodesic
On the Jackson constants in the approximation of functions by linear operators
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1987), pp. 8-15.

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     author = {A. N. Davidchik and A. A. Ligun},
     title = {On the {Jackson} constants in the approximation of functions by linear operators},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {8--15},
     publisher = {mathdoc},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_1_a1/}
}
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A. N. Davidchik; A. A. Ligun. On the Jackson constants in the approximation of functions by linear operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1987), pp. 8-15. http://geodesic.mathdoc.fr/item/IVM_1987_1_a1/