%0 Journal Article %A N. V. Grigorieva %T Study of gyrotron synchronization by an external harmonic signal based on a modified quasi-linear theory %J Izvestiya VUZ. Applied Nonlinear Dynamics %D 2021 %P 905-914 %V 29 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVP_2021_29_6_a6/ %G ru %F IVP_2021_29_6_a6