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A. S. Ponomarev, B. S. Gaisenyuk, and A. M. Kirichenko, Multifrequency Oscillations in Nonlinear Systems with Damping. Computational and Applied Mathematics [in Russian], Vishcha Shkola. Kiev (1974).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 29, No. 1, pp. 96–99, January–February, 1977.
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Gaisenyuk, B.S., Ponomarev, A.S. & Urbanskaya, V.S. Conditions for the existence of undamped autooscillations in a system with damping. Ukr Math J 29, 74–76 (1977). https://doi.org/10.1007/BF01085518
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DOI: https://doi.org/10.1007/BF01085518