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\bibitem{Gershenzon_etal1973} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., \& Ptitsina, N. G. (1973). Submillimeter spectroscopy of semiconductors. \textit{Sov. Phys. JETP}, \textit{37}(2), 299--304.

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