%0 Journal Article %A A. A. Funtov %T About nonlinear theory of two-cavity klystron with a drift space in the form of medium with complex permittivity %J Izvestiya VUZ. Applied Nonlinear Dynamics %D 2020 %P 414-424 %V 28 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVP_2020_28_4_a6/ %G ru %F IVP_2020_28_4_a6