"Development and Calibration of an Integrated Thin Ring Drawbar Pull Transducer for Agricultural Tractor". University of Khartoum Engineering Journal 2, no. 1 (نوفمبر 14, 2022). تاريخ الوصول يوليو 8, 2026. https://onlinejournals.uofk.edu/kuej/article/view/1132.