Singh, A., N. Nawayseh, L. P. Singh, S. Singh, and H. Singh. “Whole Body Vibration Exposure During Rotary Soil Tillage Operation:: The Relative Importance of Tractor Velocity, Draft and Soil Tillage Depth”. International Journal of Automotive and Mechanical Engineering, vol. 15, no. 4, Dec. 2018, pp. 5927-40, doi:10.15282/ijame.15.4.2018.15.0452.