@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/}
}