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\bibitem{Michel+Verberck2008} {\textquotedblleft}\textit{Theory of the evolution of phonon spectra and elastic constants from graphene to graphite}{\textquotedblright}. Michel KH, Verberck B, Physical review : B : solid state \textbf{78}, 085424 (2008).   http://doi.org/10.1103/PhysRevB.78.085424

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