Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1997_219_a14, author = {N. A. Il'yasov}, title = {On the {Direct} {Theorem} of {Approximation} {Theory} of {Periodic} {Functions} in {Different} {Metrics}}, journal = {Informatics and Automation}, pages = {220--234}, publisher = {mathdoc}, volume = {219}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1997_219_a14/} }
N. A. Il'yasov. On the Direct Theorem of Approximation Theory of Periodic Functions in Different Metrics. Informatics and Automation, Approximation theory. Harmonic analysis, Tome 219 (1997), pp. 220-234. http://geodesic.mathdoc.fr/item/TRSPY_1997_219_a14/