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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 3–4, June, 1991.
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Potylitsyn, A.P. Introduction. Soviet Physics Journal 34, 475–476 (1991). https://doi.org/10.1007/BF00895877
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DOI: https://doi.org/10.1007/BF00895877