Geodesic
A necessary condition for the Riesz basis property of systems of root functions of an ordinary nonselfadjoint differential operator
Differencialʹnye uravneniâ, Tome 29 (1993) no. 1, pp. 20-29.

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     author = {V. D. Budaev},
     title = {A necessary condition for the {Riesz} basis property of systems of root functions of an ordinary nonselfadjoint differential operator},
     journal = {Differencialʹnye uravneni\^a},
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     publisher = {mathdoc},
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     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_1_a3/}
}
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V. D. Budaev. A necessary condition for the Riesz basis property of systems of root functions of an ordinary nonselfadjoint differential operator. Differencialʹnye uravneniâ, Tome 29 (1993) no. 1, pp. 20-29. http://geodesic.mathdoc.fr/item/DE_1993_29_1_a3/