Geodesic
On approximation properties of complete orthonormal systems
Informatics and Automation, Investigations on the theory of functions of several real variables and approximation of functons, Tome 172 (1985), pp. 187-191.

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     author = {B. S. Kashin},
     title = {On approximation properties of complete orthonormal systems},
     journal = {Informatics and Automation},
     pages = {187--191},
     publisher = {mathdoc},
     volume = {172},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1985_172_a12/}
}
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B. S. Kashin. On approximation properties of complete orthonormal systems. Informatics and Automation, Investigations on the theory of functions of several real variables and approximation of functons, Tome 172 (1985), pp. 187-191. http://geodesic.mathdoc.fr/item/TRSPY_1985_172_a12/