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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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Bondarenko, O. I., Gershenzon, E. M., Gurvich, Y. A., Orlova, S. L., & Ptitsina, N. G. (1972). Measurement of the width of the cyclotron resonance line of n-type Ge in quantizing magnetic fields. Presumably: Sov. Phys. Semicond. | Физика и техника полупроводников, 6, 362–363.
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