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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 3–5, August, 1990.
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Rudzikas, Z.B. Introduction. Soviet Physics Journal 33, 629–630 (1990). https://doi.org/10.1007/BF00892296
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DOI: https://doi.org/10.1007/BF00892296