Geodesic
Geometric minimality conditions for systems of exponentials in $L_p[-\pi,\pi]$
Matematičeskie zametki, Tome 58 (1995) no. 5, pp. 773-777

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A proof is given of the stability theorem for minimal systems of exponentials $e(\Lambda)=\{e^{i\lambda x}\}_{\lambda\in\Lambda}$ in $L_p[-\pi,\pi]$, where $\Lambda\subset\mathbb C$ is a discrete subset. Geometric minimality conditions for such systems are obtained. 
@article{MZM_1995_58_5_a10,
     author = {M. Yu. Yurkin},
     title = {Geometric minimality conditions for systems of exponentials in $L_p[-\pi,\pi]$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {773--777},
     publisher = {mathdoc},
     volume = {58},
     number = {5},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1995_58_5_a10/}
}
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M. Yu. Yurkin. Geometric minimality conditions for systems of exponentials in $L_p[-\pi,\pi]$. Matematičeskie zametki, Tome 58 (1995) no. 5, pp. 773-777. http://geodesic.mathdoc.fr/item/MZM_1995_58_5_a10/