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\bibitem{Michel_etal2015} {\textquotedblleft}\textit{Theory of thermal expansion in 2D crystals}{\textquotedblright}. Michel KH, Costamagna, Peeters FM, Physica status solidi: B: basic research \textbf{252}, 2433 (2015).   http://doi.org/10.1002/pssb.201552286

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