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\bibitem{Gershenzon_etal1977} Gershenzon, E. M., Gol{\textquoteright}tsman, G. N., \& Kagane, M. L. (1977). Energy spectrum of acceptors in germanium and its response to a magnetic field. \textit{Sov. Phys. JETP}, \textit{45}(4), 769--776.

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