Geodesic
On biorthogonal expansions in exponential functions
Izvestiya. Mathematics , Tome 6 (1972) no. 3, pp. 579-586.

Voir la notice de l'article provenant de la source Math-Net.Ru

An equiconvergence theorem for nonharmonic Fourier series of the form $\sum a_ne^{i\lambda_nx}$ and ordinary Fourier series is proved for functions in $L^p(-\pi,\pi)$, $p>1$, when the exponents $\{\lambda_n\}$ are the roots of a member of a certain class of entire functions. 
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A. M. Sedletskii. On biorthogonal expansions in exponential functions. Izvestiya. Mathematics , Tome 6 (1972) no. 3, pp. 579-586. http://geodesic.mathdoc.fr/item/IM2_1972_6_3_a8/

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