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Translated from Izmeritel'naya Tekhnika, No. 5, pp. 53–56, May, 1969.
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Rukina, L.K. Digital tracking and balancing instruments with frequency null detectors. Meas Tech 12, 670–673 (1969). https://doi.org/10.1007/BF00994501
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DOI: https://doi.org/10.1007/BF00994501