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Additional information
Scientific-Research Physicotechnical Institute, Gor'kii University. Translated from Izvestiya VUZ. Radiofizika, Vol. 12, No. 3, pp. 334–340, March, 1969.
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Sabaev, E.F. Stability of the equilibrium state of a first-order equation with deviating argument. Radiophys Quantum Electron 12, 264–269 (1969). https://doi.org/10.1007/BF01030311
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DOI: https://doi.org/10.1007/BF01030311