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Additional information
Institute of Electronics, Bulgarian Academy of Sciences. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 27, No. 6, pp. 709–717, June, 1984.
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Spasov, A.Y., Georgiev, P.G. Perturbation of nonlinear waves. Radiophys Quantum Electron 27, 483–491 (1984). https://doi.org/10.1007/BF01040086
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DOI: https://doi.org/10.1007/BF01040086