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\bibitem{Gershenzon_etal1978} Gershenzon, E., Goltsman, G., Elantev, A., \& Kagane, M. (1978). Energy-spectrum of small donors and acceptors in germanium and effect of magnetic-field on it. In \textit{Izv. Akad. Nauk SSSR, Seriya Fizicheskaya} (Vol. 42, pp. 1142--1148).

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