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\bibitem{Leys_etal2003} {\textquotedblleft}\textit{Self consistent nonlocal linear-response theory of a relativistic electron gas}{\textquotedblright}. Leys FE, March NH, Angilella GGN, Lamoen D, Physical Review B \textbf{67}, 113105 (2003).   http://doi.org/10.1103/PhysRevB.67.113105

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