Gershenzon, E. M., Orlov, L. A., & Ptitsina, N. G. (1975). Absorption spectra in electron transitions between excited states of impurities in germanium. JETP Lett., 22(4), 95–97.
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Gershenzon, E. M., Gol'tsman, G. N., Emtsev, V. V., Mashovets, T. V., Ptitsyna, N. G., & Ryvkin, S. M. (1971). Role of impurities of groups III and V in the formation of defects following γ irradiation of germanium. JETP Lett., 14(6), 241.
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Gershenzon, E. M., Gol'tsman, G., & Ptitsina, N. G. (1973). Energy spectrum of free excitons in germanium. JETP Lett., 18(3), 93.
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Gershenzon, E. M., Gol'tsman, G. N., Multanovskii, V. V., & Ptitsina, N. G. (1981). Cross section for binding of free carriers into excitons in germanium. JETP Lett., 33(11), 574.
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Gershenzon, E. M., Gol'tsman, G. N., & Ptitsina, N. G. (1972). Observation of the free-exciton spectrum at submillimeter wavelengths. JETP Lett., 16(4), 161–162.
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