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Translated from Izmeritel'naya Tekhnika, No. 7, pp. 9–10, July, 1972.
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Boguslavskii, M.G., Éliashberg, V.M., Sharova, E.E. et al. Primary state standard of the plane angle unit — The radian. Meas Tech 15, 984–987 (1972). https://doi.org/10.1007/BF01100938
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DOI: https://doi.org/10.1007/BF01100938