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Translated from Izmeritel'naya Tekhnika, No. 2, pp. 43–45, February, 1991.
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Akhmadov, A.A.B. Raising the accuracy of phase-difference frequency converters. Meas Tech 34, 189–192 (1991). https://doi.org/10.1007/BF00990831
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DOI: https://doi.org/10.1007/BF00990831