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\bibitem{Zhang_etal2013} {\textquotedblleft}\textit{Piezoelectric surface acoustical phonon limited mobility of electrons in graphene on a GaAs substrate}{\textquotedblright}. Zhang SH, Xu W, Badalyan SM, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{87}, 075443 (2013).   http://doi.org/10.1103/PhysRevB.87.075443

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