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\bibitem{Nazar_etal2021} {\textquotedblleft}\textit{Strong anisotropic optical properties of 8-Pmmn borophene : a many-body perturbation study}{\textquotedblright}. Nazar ND, Vazifehshenas T, Ebrahimi MR, Peeters FM, Physical Chemistry Chemical Physics \textbf{23}, 16417 (2021).   http://doi.org/10.1039/D1CP01910D

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