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\bibitem{Cai_etal2016} {\textquotedblleft}\textit{Exciton pumping across type-I gallium chalcogenide heterojunctions}{\textquotedblright}. Cai H, Kang J, Sahin H, Chen B, Suslu A, Wu K, Peeters F, Meng X, Tongay S, Nanotechnology \textbf{27}, 065203 (2016).   http://doi.org/10.1088/0957-4484/27/6/065203

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