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\bibitem{Obeid_etal2020} {\textquotedblleft}\textit{A type-II GaSe/HfS$_{2}$ van der Waals heterostructure as promising photocatalyst with high carrier mobility}{\textquotedblright}. Obeid MM, Bafekry A, Rehman SU, Nguyen C V, Applied Surface Science \textbf{534}, 147607 (2020).   http://doi.org/10.1016/J.APSUSC.2020.147607

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