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\bibitem{Gershenzon_etal1971} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., \& Mel{\textquoteright}nikov, A. P. (1971). Binding energy of a carrier with a neutral impurity atom in germanium and in silicon. \textit{JETP Lett.}, \textit{14}(5), 185--186.

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