Geodesic
Criteria for the Bessel property and the Riesz basis property of systems of root functions of differential operators. I
Differencialʹnye uravneniâ, Tome 27 (1991) no. 12, pp. 2033-2044.

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     author = {V. D. Budaev},
     title = {Criteria for the {Bessel} property and the {Riesz} basis property of systems of root functions of differential operators. {I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2033--2044},
     publisher = {mathdoc},
     volume = {27},
     number = {12},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_12_a1/}
}
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V. D. Budaev. Criteria for the Bessel property and the Riesz basis property of systems of root functions of differential operators. I. Differencialʹnye uravneniâ, Tome 27 (1991) no. 12, pp. 2033-2044. http://geodesic.mathdoc.fr/item/DE_1991_27_12_a1/