Dahham Younis, A., A. Musaid Al-Nuaimi, Z. Shakeeb Al Sarraf, and M. Mahmood Hamdoon. “The Effect of Periodic Friction and Upsetting Pressure on Rotary Friction Welding Process”. Al-Rafidain Engineering Journal (AREJ), vol. 29, no. 2, Sept. 2024, pp. 65-75, doi:10.33899/arej.2024.145510.1316.