Tetewi, A. A. ., and .Belal F. Yousif. “PREDICTION OF FRICTION COEFFICIENT USING ARTIFICIAL NEURAL NETWORK”. ـJournal of Engineering Research and Applied Science, vol. 4, no. 2, Dec. 2018, pp. 61-73, https://ceh.edu.ly/JERAS/index.php/j/article/view/89.