1. (1) Kotera, T., Vibration of String with Time-Varying Length (on the Exact Solution), Transactions of the Japan Society of Mechanical Engineers, Series C, Vol. 60, No. 571 (1994), pp. 765-768.
2. (2) Yamamoto, T. et al., Vibration of String with Time-Varying Length (in Japanese), Transactions of the Japan Society of Mechanical Engineers, Vol. 44, No. 380 (1978), pp. 1175-1182.
3. (3) Hashimoto, Y., Free Vibration of String with Time-Varying Length (in Japanese), Transactions of the Japan Society of Mechanical Engineers, Series C, Vol. 57, No. 539 (1991), pp. 2167-2169.
4. (4) Kimura, H. et al., Vibration Analysis of Elevator Rope (Forced Vibration of Rope with Time-Varying Length), Journal of Environment and Engineering, Vol. 2, No. 1 (2007), pp. 89-98.
5. Vibration Analysis of Elevator Rope (2nd Report, Forced Vibration of Rope with Damping)