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\bibitem{Michel+Verberck2011} {\textquotedblleft}\textit{Theory of phonon dispersions and piezoelectricity in multilayers of hexagonal boron-nitride}{\textquotedblright}. Michel KH, Verberck B, Physica status solidi: B: basic research \textbf{248}, 2720 (2011).   http://doi.org/10.1002/pssb.201100084

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