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\bibitem{Michel+Verberck2009} {\textquotedblleft}\textit{Theory of elastic and piezoelectric effects in two-dimensional hexagonal boron nitride}{\textquotedblright}. Michel KH, Verberck B, Physical review : B : solid state \textbf{80}, 224301 (2009).   http://doi.org/10.1103/PhysRevB.80.224301

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