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Translated from Izmeritel'naya Tekhnika, No. 11, pp. 61–62, November, 1969.
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Al'perin, L.N. Critical reviews. Meas Tech 12, 1591–1593 (1969). https://doi.org/10.1007/BF00985700
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DOI: https://doi.org/10.1007/BF00985700