Literature cited
V. A. Laptev and G. M. Mozhevitin, Izmer. Tekh., No. 2 (1977).
V. A. Laptev et al., Inventor's Certificate No. 507781, Byull. Izobr., No. 12 (1976).
A. A. Gorbatov and G. E. Rudashevskii, Acoustic Methods and Apparatus for Measuring Distances in Air [in Russian], Énergiya, Moscow (1973).
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Translated from Izmeritel'naya Tekhnika, No. 12, pp. 35–36, December, 1978.
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Laptev, V.A., Mozhevitin, G.M. Measuring the average level of material arranged in arbitrary fashion in a tank. Meas Tech 21, 1671–1672 (1978). https://doi.org/10.1007/BF00832887
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DOI: https://doi.org/10.1007/BF00832887