Geodesic
On Existence of Best Approximation of a~Function of Two Variables by Sums of Plane Waves
Informatics and Automation, Approximation theory. Harmonic analysis, Tome 219 (1997), pp. 130-136.

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     author = {A. L. Garkavi},
     title = {On {Existence} of {Best} {Approximation} of {a~Function} of {Two} {Variables} by {Sums} of {Plane} {Waves}},
     journal = {Informatics and Automation},
     pages = {130--136},
     publisher = {mathdoc},
     volume = {219},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1997_219_a10/}
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A. L. Garkavi. On Existence of Best Approximation of a~Function of Two Variables by Sums of Plane Waves. Informatics and Automation, Approximation theory. Harmonic analysis, Tome 219 (1997), pp. 130-136. http://geodesic.mathdoc.fr/item/TRSPY_1997_219_a10/