Chaos-Chaos Intermittency Synchronization Controlled by External Feedback Signals in Chua's Circuits. - Sou Nobukawa; Hirotaka Doho; Natsusaku Shibata; Haruhiko Nishimura; Teruya Yamanishi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)