S. K. Tiwari and  Dinesh Kumar Shukla and  R. Chandra,  Friction Stir Welding of Aluminum Alloys: A Review.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2013, vol. 84(12). 2403 - 2408
    [viewed 12 December 2019]. Available from: https://publications.waset.org/pdf/9996603.