Literature cited
B. M. Levin, Author's Certificate No. 214,135, Byull. Izobr., No. 11 (1968).
B. M. Levin and V. T. Martynov, Izmeritel'. Tekh., No. 5 (1968).
Additional information
Translated from Izmeritel'naya Tekhnika, No. 2, pp. 54–55, February, 1976.
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Levin, B.M., Volkova, T.A. & Leont'eva, G.V. Universal optical string OS-3M. Meas Tech 19, 252–254 (1976). https://doi.org/10.1007/BF00817645
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DOI: https://doi.org/10.1007/BF00817645