Gershenzon EM, Gol'tsman GN. Transitions of electrons between excited states of donors in germanium. JETP Lett. 1971;14(2):63–5.
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Gershenzon EM, Goltsman GN, Ptitsyna NG. Investigation of excited donor states in GaAs. Sov Phys Semicond. 1974;7(10):1248–50.
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Gershenzon EM, Orlov LA, Ptitsina NG. Absorption spectra in electron transitions between excited states of impurities in germanium. JETP Lett. 1975;22(4):95–7.
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Gershenzon EM, Goltsman GN, Orlov L. Investigation of population and ionization of donor excited states in Ge. In: Physics of Semiconductors. North-Holland Publishing Co.; 1976. p. 631–4.
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Gershenzon EM, Gol'tsman GN, Ptitsyna NG. Carrier lifetime in excited states of shallow impurities in germanium. JETP Lett. 1977;25(12):539–43.
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