Safari, Mehdi, Javad Salimi, and Saeid Hamidipoor. 2017. “Experimental and Numerical Investigation of Hydro-Forming of Stepped Tubes for Aluminum Alloy 6063”. Journal of Mechanical Engineering and Technology (JMET) 9 (2):59-70. https://jmet.utem.edu.my/jmet/article/view/2176.