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\bibitem{Nikogosyan_etal2019} Nikogosyan AS, Martirosyan RM, Hakhoumian AA, Makaryan AH, Tadevosyan VR, Goltsman GN, et al. Effect of absorption on the efficiency of terahertz radiation generation in the metal waveguide partially filled with nonlinear crystal LiNbO3, DAST or ZnTe. J Contemp Phys. 2019;54(1):97--104.

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