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This is an update request for the document 3 THz quantum-cascade laser with metallic waveguide based on resonant-phonon depopulation scheme by Zubov F.I., Ikonnikov A.V., Maremyanin K.V., Morozov S.V., Gavrilenko V.I., Pavlov A. Yu., Shchavruk N.V., Khabibulin R.A., Reznik R.R., Cirlin G.E., Zhukov A.E., Dubinov A.A. and Alferov Zh.I.

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