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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 135–137, September, 1977.
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Ul'yanov, V.V., Kichigina, E.V. & Perel'muter, M.S. Nonlinear zero oscillations. Soviet Physics Journal 20, 1232–1234 (1977). https://doi.org/10.1007/BF00897140
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DOI: https://doi.org/10.1007/BF00897140