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\bibitem{Bacaksiz_etal2015} {\textquotedblleft}\textit{Hexagonal A1N : dimensional-crossover-driven band-gap transition}{\textquotedblright}. Bacaksiz C, Sahin H, Ozaydin HD, Horzum S, Senger RT, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{91}, 085430 (2015).   http://doi.org/10.1103/PhysRevB.91.085430

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