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Additional information
Translated from Izmeritel'naya Tekhnika, No. 7, pp. 34–37, July, 1970.
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Finkel'shtein, V.E., Kisel', A.N. Lowering the sensitivity threshold and raising the precision of photoelectric pyrometers and spectropyrometers. Meas Tech 13, 1015–1020 (1970). https://doi.org/10.1007/BF00994552
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DOI: https://doi.org/10.1007/BF00994552