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Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 4, pp. 48–50, April, 1987.
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Kornev, V.E., Zhirnov, E.L. Experience in operating The ÉRO-3 speed relay and its modernization. Hydrotechnical Construction 21, 237–239 (1987). https://doi.org/10.1007/BF01429619
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DOI: https://doi.org/10.1007/BF01429619