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Additional information
Translated from Izmeritel'naya Tekhnika, No. 1, pp. 46–48, January, 1993.
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Ovcharenko, N.I. Speed of protective instrument relays with operation based on comparing amplitudes and phases of two sinusoidal quantities. Meas Tech 36, 67–69 (1993). https://doi.org/10.1007/BF00986179
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DOI: https://doi.org/10.1007/BF00986179