%0 Journal Article %A E. S. Semenov %A O. P. Plankin %A R. M. Rozental' %T Development of methods of gyrotrons electron-optics systems with axial symmetry distortion %J Izvestiya VUZ. Applied Nonlinear Dynamics %D 2015 %P 94-105 %V 23 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVP_2015_23_3_a7/ %G ru %F IVP_2015_23_3_a7