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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.

Your paper was deposited in Directory of Open Access Journals (new) and appears online at https://doaj.org/article/86946e829645496ca8ab9e81c7f9093e
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