Sharma, H. D., M. P. Yadav, and B. M. Sharma. “Friction of Pneumatic Rubber Tyres on Sand”. Defence Science Journal 20, no. 2 (April 1, 2014): 129–134. Accessed July 6, 2025. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/6142.