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\bibitem{Michel+Verberck2012} {\textquotedblleft}\textit{Rigid-plane phonons in layered crystals}{\textquotedblright}. Michel KH, Verberck B, Physica status solidi: B: basic research \textbf{249}, 2604 (2012).   http://doi.org/10.1002/pssb.201200119

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