I. O. Krasnobaev, “A Necessary Condition for the Completeness of the System $\{e^{-\lambda_nt}\mid\operatorname{Re}\lambda_n>0\}$ in the Spaces $C_0(\mathbb R_+)$ and $L^p(\mathbb R_+)$, $p>2$”, Mat. Zametki, 83:6 (2008), 831–842; Math. Notes, 83:6 (2008), 759–769
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