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Izvestiya VUZ. Radiofizika, Vol. 11, No. 7, pp. 1053–1059, 1968
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Karmov, L.N. Approximate determination of periodic motions of autonomous systems. Radiophys Quantum Electron 11, 602–605 (1968). https://doi.org/10.1007/BF01089386
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DOI: https://doi.org/10.1007/BF01089386