Ren, Diandong, Lance M. Leslie, and Congbin Fu. “Stress Fields in Granular Material and Implications for Performance of Robot Locomotion over Granular Media”. JOURNAL OF ADVANCES IN PHYSICS 8, no. 1 (March 2, 2015): 2005–2009. Accessed April 28, 2024. https://rajpub.com/index.php/jap/article/view/1530.