1. Liu X X, Wang Z, et al. Effect of mass of vertical vibration spring on vibration period, J. University Physics, 2010, 29 (11): 51–54.
2. Huanh Z L. Effects of spring mass on vibration, J. University Physics, 1998, 17 (3): 12–16.
3. Chen J H. Period of vibration of the spring oscillator system, J. University Physics, 1988, 7 (12): 1–3.
4. Luo W Y. Further discussion on natural frequency of spring oscillator, J. University Physics, 1985,4 (11): 9–11.
5. Leclerc M. Effective elastic constants and effective masses of vibration springs, J. Li G Q, Translated. University Physics, 1990, 9 (6): 10–11.