Geodesic
On Riesz basises of the eigen and associated functions of the functional-differential operator with a~variable structure
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 7 (2007) no. 2, pp. 20-25.

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For a functional-differential operator of a variable structure with integral boundary conditions the Riesz basisness of its eigen and associated functions in the space $L^3_2[0,1]$ is proved. 
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V. P. Kurdyumov; A. P. Khromov. On Riesz basises of the eigen and associated functions of the functional-differential operator with a~variable structure. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 7 (2007) no. 2, pp. 20-25. http://geodesic.mathdoc.fr/item/ISU_2007_7_2_a4/

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