Ayman A. Abd-Eltwab, Karim M. Atia, Essam K. Saied, A. M. Atia. 2022. “An Investigation into the Forming of Tube Ends Using the Ballizing Process”. Design Engineering, no. 1 (May), 3358 -74. http://thedesignengineering.com/index.php/DE/article/view/9432.