A. A. Salman, A. M. Takak, and K. K. Resan, “Enhancements of mechanical properties of friction stir welding for 6061 aluminum alloy by Friction Stir Processing (FSP) method”., BJES, vol. 14, no. 2, pp. 62–66, Jun. 2014, doi: 10.33971/bjes.14.2.8.