Geodesic
Exzact Jackson inequality in $L_p(0,2\pi)$ $(1\le p2)$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Proceedings of the All-Union school on the theory of functions, Tome 198 (1992), pp. 232-241 
N. I. Chernykh. Exzact Jackson inequality in $L_p(0,2\pi)$ $(1\le p<2)$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Proceedings of the All-Union school on the theory of functions, Tome 198 (1992), pp. 232-241. http://geodesic.mathdoc.fr/item/TM_1992_198_a12/
@article{TM_1992_198_a12,
     author = {N. I. Chernykh},
     title = {Exzact {Jackson} inequality in $L_p(0,2\pi)$ $(1\le p<2)$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {232--241},
     year = {1992},
     volume = {198},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1992_198_a12/}
}
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