Gaurinindi, M. F., E. P. Pamungkasari, and B. Murti. “Meta-Analysis the Effects of Stretching and Whole Body Vibration Exercise in Reducing Low Back Pain Among Heavy Equipment Operator Workers”. Journal of Epidemiology and Public Health, vol. 6, no. 4, Oct. 2021, pp. 426-37, https://jepublichealth.com/index.php/jepublichealth/article/view/440.