Dau, Ngo. “NEGATIVE SKIN FRICTION EFFECT IN CONSTRUCTION AND SOME METHODS TO REDUCE NEGATIVE SKIN FRICTION EFFECT”. Science and Technology Development Journal 12, no. 6 (March 28, 2009): 96-103. Accessed April 4, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/2258.