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\bibitem{Gershenzon_etal1986} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., Ptitsina, N. G., \& Riger, E. R. (1986). Effect of electron-electron collisions on the trapping of free carriers by shallow impurity centers in germanium. \textit{Sov. Phys. JETP}, \textit{64}(4), 889--897.

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