Geodesic
On the proximity of the Riesz basises to the ortonormed basises in Hilbert space
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 15, Tome 127 (1983), pp. 201-208

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The conditions of existence and some properties of a special class of Riesz basases in Hilbert space are formulated The consequences of these conditions for the system of eigenfunctions of the restriction of the operator conjugate to the shift operator and for the system of resonant states of certain scattering problem are formulated 
@article{ZNSL_1983_127_a11,
     author = {M. A. Shubova},
     title = {On the proximity of the {Riesz} basises to the ortonormed basises in {Hilbert} space},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {201--208},
     publisher = {mathdoc},
     volume = {127},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_127_a11/}
}
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M. A. Shubova. On the proximity of the Riesz basises to the ortonormed basises in Hilbert space. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 15, Tome 127 (1983), pp. 201-208. http://geodesic.mathdoc.fr/item/ZNSL_1983_127_a11/