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\bibitem{Gershenzon_etal1981} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., Multanovskii, V. V., \& Ptitsina, N. G. (1981). Cross section for binding of free carriers into excitons in germanium. \textit{JETP Lett.}, \textit{33}(11), 574.

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