Popova Е. S. RussiaSaratov Saratov State University, ul. Astrakhanskaya, 83, Saratov, 410012, Russia LenochkaFNP@yandex.ru Additional info Аспирант факультета нано- и биомедицинских технологий СГУ. Author's articles DOUBLING AND DESTRUCTION OF THE TRI-FREQUENCIES TORUS IN THE NONLINEAR OSCILLATOR UNDER QUASI-PERIODIC EXITATION: EXPERIMENT INFLUENCE OF FLUCTUATIONS ON EVOLUTION OF THREE-DIMENSIONAL TORUS IN NONAUTONOMOUS SYSTEM