Che Ariffin, Muhammad Najmi, and Muhammad Khairudin Awang. “Empirical Mathematical Model of Multiple Interaction Cracks”. Research Progress in Mechanical and Manufacturing Engineering, vol. 2, no. 2, Jan. 2022, pp. 311-7, https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/3765.