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\bibitem{Michel+Verberck2012} {\textquotedblleft}\textit{Theory of rigid-plane phonon modes in layered crystals}{\textquotedblright}. Michel KH, Verberck B, Physical review : B : condensed matter and materials physics \textbf{85}, 094303 (2012).   http://doi.org/10.1103/PhysRevB.85.094303

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