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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, Vol. 12, No. 1, pp. 125–127, January, 1969
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Kovalenko, E.S., Tikhomirov, A.A. Possible population inversion in the ground-state sublevels in a laser. Soviet Physics Journal 12, 95–97 (1969). https://doi.org/10.1007/BF00815528
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DOI: https://doi.org/10.1007/BF00815528