Geodesic
On the Bessel inequality for systems of root functions of
Doklady Akademii Nauk, Tome 318 (1991) no. 1, pp. 16-20.

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     author = {V. D. Budaev},
     title = {On the {Bessel} inequality for systems of root functions of},
     journal = {Doklady Akademii Nauk},
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     volume = {318},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_1_a1/}
}
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V. D. Budaev. On the Bessel inequality for systems of root functions of. Doklady Akademii Nauk, Tome 318 (1991) no. 1, pp. 16-20. http://geodesic.mathdoc.fr/item/DAN_1991_318_1_a1/