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\bibitem{Chaves_etal2021} {\textquotedblleft}\textit{Signatures of subband excitons in few-layer black phosphorus}{\textquotedblright}. Chaves A, Sousa GO, Khaliji K, da Costa DR, Farias GA, Low T, Physical Review B \textbf{103}, 165428 (2021).   http://doi.org/10.1103/PHYSREVB.103.165428

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