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\bibitem{Gershenzon_etal1979} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., \& Ptitsina, N. G. (1979). Population and lifetime of excited states of shallow impurities in Ge. \textit{Sov. Phys. JETP}, \textit{49}(2), 355--362.

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