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\bibitem{Yagmurcukardes_etal2016} {\textquotedblleft}\textit{Mechanical properties of monolayer GaS and GaSe crystals}{\textquotedblright}. Yagmurcukardes M, Senger RT, Peeters FM, Sahin H, Physical review B \textbf{94}, 245407 (2016).   http://doi.org/10.1103/PHYSREVB.94.245407

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