“…6,8,9 The occurrence of VR has been studied in a monostable, 10 bistable, 1,8,9,11,12 and three well 13 systems. Moreover, it has been also analyzed in excitable systems, 14 vertical cavity surface emitting laser, 15,16 coupled oscillators, 4,17,18 and time-delay systems. [19][20][21][22] Very recently, VR is found to induce undamped low-frequency signal propagation in one-way coupled 17 and globally coupled 23 bistable systems.…”