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\bibitem{Santos-Castro_etal2023} {\textquotedblleft}\textit{Silicon and germanium adamantane and diamantane monolayers as two-dimensional anisotropic direct-gap semiconductors}{\textquotedblright}. Santos-Castro G, Pandey T, Bruno CHV, Santos Caetano EW, Milo{\v s}evi{\'c} MV, Chaves A, Freire VN, Physical review B \textbf{108}, 035302 (2023).   http://doi.org/10.1103/PHYSREVB.108.035302

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