Sergeev A. S. RussiaNizhny Novgorod Institute of applied physics RAS, 603950 Nizhny Novgorod,GSP-120, Ulyanov str., 46 sergeev@appl.sci-nnov.ru Author's articles AUTOMODULATION AND CHAOTIC REGIMES OF GENERATION IN A TWO-RESONATOR GYROKLYSTRON WITH DELAYED FEEDBACK