Kang, Y., S. Park, D. Lee, S. Song, M.-R. Choi, and G. Lee. “Comparison of Lower Limb Muscle Activation According to Horizontal Whole-Body Vibration Frequency and Knee Angle”. Journal of Human Sport and Exercise, vol. 15, no. 1, Mar. 2020, pp. 119-27, doi:10.14198/jhse.2020.151.11.