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Chelyabinsk Pipe Mill. Translated from Metallurg, No. 10, pp. 38–39, October, 1982.
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Kishkin, L.M., Berdnikov, V.A. & Kuznetsov, É.M. Welding small-diameter tubes with radio-frequency currents without a ferrite core. Metallurgist 26, 380–381 (1982). https://doi.org/10.1007/BF00740221
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DOI: https://doi.org/10.1007/BF00740221