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Translated from Izmeritel'naya Tekhnika, No. 6, pp. 68–70, June, 1967.
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Gal'perin, L.N., Dovbii, E.V. Automatic meter of derivatives and integrals of prolonged slowly changing weak signals. Meas Tech 10, 732–734 (1967). https://doi.org/10.1007/BF00980671
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DOI: https://doi.org/10.1007/BF00980671