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\bibitem{Bespalov_etal1991} Bespalov, A. V., Gol{\textquoteright}tsman, G. N., Semenov, A. D., \& Renk, K. F. (1991). Determination of the far-infrared emission characteristic of a cyclotron p-germanium laser by use of a superconducting Nb detector. \textit{Solid State Communications}, \textit{80}(7), 503--506.

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