@article{MZM_1993_53_4_a11,
author = {O. I. Smirnov},
title = {The {Jackson} theorem in $L_2$ for {Christenson{\textendash}Levy} systems},
journal = {Matemati\v{c}eskie zametki},
pages = {111--130},
year = {1993},
volume = {53},
number = {4},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/MZM_1993_53_4_a11/}
}
O. I. Smirnov. The Jackson theorem in $L_2$ for Christenson–Levy systems. Matematičeskie zametki, Tome 53 (1993) no. 4, pp. 111-130. http://geodesic.mathdoc.fr/item/MZM_1993_53_4_a11/
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