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\bibitem{Kang_etal2015} {\textquotedblleft}\textit{Mechanical properties of monolayer sulphides : a comparative study between MoS$_{2}$, HfS$_{2}$ and TiS$_{3}$}{\textquotedblright}. Kang J, Sahin H, Peeters FM, Physical chemistry, chemical physics \textbf{17}, 27742 (2015).   http://doi.org/10.1039/c5cp04576b

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