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Additional information
Scientific-Research Physicotechnical Institute, Gorkii University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 23, No. 5, pp. 617–625, May, 1980.
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Romanov, Y.A. Upwards parametric frequency conversion in superlattices. Radiophys Quantum Electron 23, 421–428 (1980). https://doi.org/10.1007/BF01033742
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DOI: https://doi.org/10.1007/BF01033742