Kondoff, Christo, Rossen Mikhov, Leoneed Kirilov, Radostina Zaekova, and Plamen Tashev. “WORKING REGIMES FOR FRICTION STIR PROCESSING OF ALUMINIUM ALLOY A6061”. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 3 (January 16, 2024): 139–144. Accessed May 18, 2024. https://journals.rta.lv/index.php/ETR/article/view/7235.