Geodesic
A necessary condition for the Riesz basis property of systems of
Doklady Akademii Nauk, Tome 321 (1991) no. 5, pp. 873-875 
V. D. Budaev. A necessary condition for the Riesz basis property of systems of. Doklady Akademii Nauk, Tome 321 (1991) no. 5, pp. 873-875. http://geodesic.mathdoc.fr/item/DAN_1991_321_5_a0/
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     author = {V. D. Budaev},
     title = {A necessary condition for the {Riesz} basis property of systems of},
     journal = {Doklady Akademii Nauk},
     pages = {873--875},
     year = {1991},
     volume = {321},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_321_5_a0/}
}
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