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Additional information
Kharkov State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 24, No. 7, pp. 819–824, July, 1981.
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Efremov, V.A., Dyubko, S.F. Amplification in a three-level gas excited by two unidirectional waves. Radiophys Quantum Electron 24, 560–564 (1981). https://doi.org/10.1007/BF01034552
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DOI: https://doi.org/10.1007/BF01034552