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\bibitem{Bafekry_etal2021} {\textquotedblleft}\textit{A Dirac-semimetal two-dimensional BeN4 : thickness-dependent electronic and optical properties}{\textquotedblright}. Bafekry A, Stampfl C, Faraji M, Yagmurcukardes M, Fadlallah MM, Jappor HR, Ghergherehchi M, Feghhi SAH, Applied Physics Letters \textbf{118}, 203103 (2021).   http://doi.org/10.1063/5.0051878

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