Bakunin V. L. RussiaNizhny Novgorod Institute of Applied Physics of the Russian Academy of Sciences, ul. Ul'yanova, 46, Nizhny Novgorod , 603950, Russia knightrider7@yandex.ru Author's articles ZONES OF STABLE SINGLE-MODE GENERATION IN OVERMODED GYROTRONS GYROTRON FREQUENCY STABILIZATION UNDER THE INFLUENCE OF EXTERNAL MONOCHROMATIC SIGNAL OR WAVE REFLECTED FROM THE LOAD: REVIEW