On the Direct Theorem of Approximation Theory of Periodic Functions in Different Metrics
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Approximation theory. Harmonic analysis, Tome 219 (1997), pp. 220-234.

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     author = {N. A. Il'yasov},
     title = {On the {Direct} {Theorem} of {Approximation} {Theory} of {Periodic} {Functions} in {Different} {Metrics}},
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N. A. Il'yasov. On the Direct Theorem of Approximation Theory of Periodic Functions in Different Metrics. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Approximation theory. Harmonic analysis, Tome 219 (1997), pp. 220-234. http://geodesic.mathdoc.fr/item/TM_1997_219_a14/