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2. Measurement of local frequency from digitized bus voltage samples;Sachdev;Trans. Can. Electr. Assoc.,1984
3. Amplitude and frequency measurements by discrete Fourier transform;Sachdev;Trans. Can. Electr. Assoc.,1985
4. A new measurement technique for tracking voltage phasors, local system frequency, and rate of change of frequency;Phadek;IEEE Trans.,1983
5. A new technique for curve fitting based on minimum absolute deviations;Soliman;Comput. Stat. Data Anal.,1988