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\bibitem{Gershenzon_etal1977} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., \& Ptitsyna, N. G. (1977). Carrier lifetime in excited states of shallow impurities in germanium. \textit{JETP Lett.}, \textit{25}(12), 539--543.

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