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\bibitem{Gershenzon_etal1978} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., \& Kagane, M. L. (1978). Observation of free carrier resonances in p-type germanium at submillimeter wavelengths. \textit{Sov. Phys. Solid State}, \textit{20}(4), 573--579.

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