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\bibitem{Li_etal2020} {\textquotedblleft}\textit{Optical absorption window in Na$_{3}$Bi based three-dimensional Dirac electronic system}{\textquotedblright}. Li QN, Xu W, Xiao YM, Ding L, Van Duppen B, Peeters FM, Journal Of Applied Physics \textbf{128}, 155707 (2020).   http://doi.org/10.1063/5.0022669

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