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\bibitem{Goltsman_etal1986} Goltsman, G. N., Maliavkin, A. V., Ptitsina, N. G., \& Selevko, A. G. (1986). Magnetic exciton spectroscopy in uniaxially compressed Ge at submillimeter waves. In \textit{Izv. Akad. Nauk SSSR, Seriya Fizicheskaya} (Vol. 50, pp. 280--281).

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